diff --git a/server/src/main/java/org/opensearch/action/ActionFuture.java b/server/src/main/java/org/opensearch/action/ActionFuture.java
index b1795ecf30b11..77b748f50bfbf 100644
--- a/server/src/main/java/org/opensearch/action/ActionFuture.java
+++ b/server/src/main/java/org/opensearch/action/ActionFuture.java
@@ -40,7 +40,7 @@
 /**
  * An extension to {@link Future} allowing for simplified "get" operations.
  *
- *
+ * @opensearch.internal
  */
 public interface ActionFuture<T> extends Future<T> {
 
diff --git a/server/src/main/java/org/opensearch/action/ActionListener.java b/server/src/main/java/org/opensearch/action/ActionListener.java
index 13c6aa96ceee6..8f632449c7d91 100644
--- a/server/src/main/java/org/opensearch/action/ActionListener.java
+++ b/server/src/main/java/org/opensearch/action/ActionListener.java
@@ -45,6 +45,8 @@
 
 /**
  * A listener for action responses or failures.
+ *
+ * @opensearch.internal
  */
 public interface ActionListener<Response> {
     /**
diff --git a/server/src/main/java/org/opensearch/action/ActionListenerResponseHandler.java b/server/src/main/java/org/opensearch/action/ActionListenerResponseHandler.java
index 83ac650bf48af..26e9ba8621c53 100644
--- a/server/src/main/java/org/opensearch/action/ActionListenerResponseHandler.java
+++ b/server/src/main/java/org/opensearch/action/ActionListenerResponseHandler.java
@@ -45,6 +45,8 @@
 /**
  * A simple base class for action response listeners, defaulting to using the SAME executor (as its
  * very common on response handlers).
+ *
+ * @opensearch.internal
  */
 public class ActionListenerResponseHandler<Response extends TransportResponse> implements TransportResponseHandler<Response> {
 
diff --git a/server/src/main/java/org/opensearch/action/ActionModule.java b/server/src/main/java/org/opensearch/action/ActionModule.java
index 9d1926f0d5ae5..790f8f6cbdc36 100644
--- a/server/src/main/java/org/opensearch/action/ActionModule.java
+++ b/server/src/main/java/org/opensearch/action/ActionModule.java
@@ -419,6 +419,8 @@
 
 /**
  * Builds and binds the generic action map, all {@link TransportAction}s, and {@link ActionFilters}.
+ *
+ * @opensearch.internal
  */
 public class ActionModule extends AbstractModule {
 
diff --git a/server/src/main/java/org/opensearch/action/ActionRequest.java b/server/src/main/java/org/opensearch/action/ActionRequest.java
index d000155c55b7d..c6d8eb9f273d6 100644
--- a/server/src/main/java/org/opensearch/action/ActionRequest.java
+++ b/server/src/main/java/org/opensearch/action/ActionRequest.java
@@ -38,6 +38,11 @@
 
 import java.io.IOException;
 
+/**
+ * Base action request
+ *
+ * @opensearch.internal
+ */
 public abstract class ActionRequest extends TransportRequest {
 
     public ActionRequest() {
diff --git a/server/src/main/java/org/opensearch/action/ActionRequestBuilder.java b/server/src/main/java/org/opensearch/action/ActionRequestBuilder.java
index 7a81d07c6927a..d1fddb076b350 100644
--- a/server/src/main/java/org/opensearch/action/ActionRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/ActionRequestBuilder.java
@@ -37,6 +37,11 @@
 
 import java.util.Objects;
 
+/**
+ * Base Action Request Builder
+ *
+ * @opensearch.internal
+ */
 public abstract class ActionRequestBuilder<Request extends ActionRequest, Response extends ActionResponse> {
 
     protected final ActionType<Response> action;
diff --git a/server/src/main/java/org/opensearch/action/ActionRequestValidationException.java b/server/src/main/java/org/opensearch/action/ActionRequestValidationException.java
index 7ada8cdc77f14..d7da932c4dfc2 100644
--- a/server/src/main/java/org/opensearch/action/ActionRequestValidationException.java
+++ b/server/src/main/java/org/opensearch/action/ActionRequestValidationException.java
@@ -34,4 +34,9 @@
 
 import org.opensearch.common.ValidationException;
 
+/**
+ * Base exception for an action request validation
+ *
+ * @opensearch.internal
+ */
 public class ActionRequestValidationException extends ValidationException {}
diff --git a/server/src/main/java/org/opensearch/action/ActionResponse.java b/server/src/main/java/org/opensearch/action/ActionResponse.java
index 65008e7e0e279..c72fc87ccfaf8 100644
--- a/server/src/main/java/org/opensearch/action/ActionResponse.java
+++ b/server/src/main/java/org/opensearch/action/ActionResponse.java
@@ -39,6 +39,8 @@
 
 /**
  * Base class for responses to action requests.
+ *
+ * @opensearch.internal
  */
 public abstract class ActionResponse extends TransportResponse {
 
diff --git a/server/src/main/java/org/opensearch/action/ActionRunnable.java b/server/src/main/java/org/opensearch/action/ActionRunnable.java
index 84b04214e79ee..c718b33bd404a 100644
--- a/server/src/main/java/org/opensearch/action/ActionRunnable.java
+++ b/server/src/main/java/org/opensearch/action/ActionRunnable.java
@@ -40,6 +40,8 @@
 /**
  * Base class for {@link Runnable}s that need to call {@link ActionListener#onFailure(Exception)} in case an uncaught
  * exception or error is thrown while the actual action is run.
+ *
+ * @opensearch.internal
  */
 public abstract class ActionRunnable<Response> extends AbstractRunnable {
 
diff --git a/server/src/main/java/org/opensearch/action/ActionType.java b/server/src/main/java/org/opensearch/action/ActionType.java
index fbc9524ce4e52..9c17061990abe 100644
--- a/server/src/main/java/org/opensearch/action/ActionType.java
+++ b/server/src/main/java/org/opensearch/action/ActionType.java
@@ -38,6 +38,8 @@
 
 /**
  * A generic action. Should strive to make it a singleton.
+ *
+ * @opensearch.internal
  */
 public class ActionType<Response extends ActionResponse> {
 
diff --git a/server/src/main/java/org/opensearch/action/AliasesRequest.java b/server/src/main/java/org/opensearch/action/AliasesRequest.java
index a33db646cebba..4c5d5628b1aac 100644
--- a/server/src/main/java/org/opensearch/action/AliasesRequest.java
+++ b/server/src/main/java/org/opensearch/action/AliasesRequest.java
@@ -37,6 +37,8 @@
  * one or more indices and one or more aliases. Meant to be used for aliases management requests (e.g. add/remove alias,
  * get aliases) that hold aliases and indices in separate fields.
  * Allows to retrieve which indices and aliases the action relates to.
+ *
+ * @opensearch.internal
  */
 public interface AliasesRequest extends IndicesRequest.Replaceable {
 
diff --git a/server/src/main/java/org/opensearch/action/CompositeIndicesRequest.java b/server/src/main/java/org/opensearch/action/CompositeIndicesRequest.java
index 25ef0d220beec..1ec2350e713df 100644
--- a/server/src/main/java/org/opensearch/action/CompositeIndicesRequest.java
+++ b/server/src/main/java/org/opensearch/action/CompositeIndicesRequest.java
@@ -37,5 +37,7 @@
  * multiple sub-requests which relate to one or more indices.  A composite request is executed by its own transport action class
  * (e.g. {@link org.opensearch.action.search.TransportMultiSearchAction}), which goes through all sub-requests and delegates their
  * execution to the appropriate transport action (e.g. {@link org.opensearch.action.search.TransportSearchAction}) for each single item.
+ *
+ * @opensearch.internal
  */
 public interface CompositeIndicesRequest {}
diff --git a/server/src/main/java/org/opensearch/action/DocWriteRequest.java b/server/src/main/java/org/opensearch/action/DocWriteRequest.java
index 11d645435c71c..a789189f9227e 100644
--- a/server/src/main/java/org/opensearch/action/DocWriteRequest.java
+++ b/server/src/main/java/org/opensearch/action/DocWriteRequest.java
@@ -53,6 +53,8 @@
 /**
  * Generic interface to group ActionRequest, which perform writes to a single document
  * Action requests implementing this can be part of {@link org.opensearch.action.bulk.BulkRequest}
+ *
+ * @opensearch.internal
  */
 public interface DocWriteRequest<T> extends IndicesRequest, Accountable {
 
diff --git a/server/src/main/java/org/opensearch/action/DocWriteResponse.java b/server/src/main/java/org/opensearch/action/DocWriteResponse.java
index 587f93ed09f52..5247b0264064a 100644
--- a/server/src/main/java/org/opensearch/action/DocWriteResponse.java
+++ b/server/src/main/java/org/opensearch/action/DocWriteResponse.java
@@ -63,6 +63,8 @@
 
 /**
  * A base class for the response of a write operation that involves a single doc
+ *
+ * @opensearch.internal
  */
 public abstract class DocWriteResponse extends ReplicationResponse implements WriteResponse, StatusToXContentObject {
 
diff --git a/server/src/main/java/org/opensearch/action/FailedNodeException.java b/server/src/main/java/org/opensearch/action/FailedNodeException.java
index b4927d0b40a6a..268a8e370a155 100644
--- a/server/src/main/java/org/opensearch/action/FailedNodeException.java
+++ b/server/src/main/java/org/opensearch/action/FailedNodeException.java
@@ -39,6 +39,11 @@
 
 import java.io.IOException;
 
+/**
+ * Base exception for a failed node
+ *
+ * @opensearch.internal
+ */
 public class FailedNodeException extends OpenSearchException {
 
     private final String nodeId;
diff --git a/server/src/main/java/org/opensearch/action/IndicesRequest.java b/server/src/main/java/org/opensearch/action/IndicesRequest.java
index 18da6ed0f62b2..d2e4504dd7db1 100644
--- a/server/src/main/java/org/opensearch/action/IndicesRequest.java
+++ b/server/src/main/java/org/opensearch/action/IndicesRequest.java
@@ -39,6 +39,8 @@
  * one or more indices. Allows to retrieve which indices the action relates to.
  * In case of internal requests originated during the distributed execution of an external request,
  * they will still return the indices that the original request related to.
+ *
+ * @opensearch.internal
  */
 public interface IndicesRequest {
 
diff --git a/server/src/main/java/org/opensearch/action/LatchedActionListener.java b/server/src/main/java/org/opensearch/action/LatchedActionListener.java
index 4a79cfd898a85..57d5c9282465f 100644
--- a/server/src/main/java/org/opensearch/action/LatchedActionListener.java
+++ b/server/src/main/java/org/opensearch/action/LatchedActionListener.java
@@ -37,6 +37,8 @@
 /**
  * An action listener that allows passing in a {@link CountDownLatch} that
  * will be counted down after onResponse or onFailure is called
+ *
+ * @opensearch.internal
  */
 public class LatchedActionListener<T> implements ActionListener<T> {
 
diff --git a/server/src/main/java/org/opensearch/action/ListenableActionFuture.java b/server/src/main/java/org/opensearch/action/ListenableActionFuture.java
index 9c8510a06173c..95bf3a2ae1384 100644
--- a/server/src/main/java/org/opensearch/action/ListenableActionFuture.java
+++ b/server/src/main/java/org/opensearch/action/ListenableActionFuture.java
@@ -35,7 +35,7 @@
 /**
  * An {@link ActionFuture} that listeners can be added to.
  *
- *
+ * @opensearch.internal
  */
 public interface ListenableActionFuture<T> extends ActionFuture<T> {
 
diff --git a/server/src/main/java/org/opensearch/action/NoShardAvailableActionException.java b/server/src/main/java/org/opensearch/action/NoShardAvailableActionException.java
index 4e1571d8007f6..8cb6ff5c9de81 100644
--- a/server/src/main/java/org/opensearch/action/NoShardAvailableActionException.java
+++ b/server/src/main/java/org/opensearch/action/NoShardAvailableActionException.java
@@ -39,6 +39,11 @@
 
 import java.io.IOException;
 
+/**
+ * Base exception for no shard available
+ *
+ * @opensearch.internal
+ */
 public class NoShardAvailableActionException extends OpenSearchException {
 
     public NoShardAvailableActionException(ShardId shardId) {
diff --git a/server/src/main/java/org/opensearch/action/NoSuchNodeException.java b/server/src/main/java/org/opensearch/action/NoSuchNodeException.java
index 898a3d124111c..3889809b7f186 100644
--- a/server/src/main/java/org/opensearch/action/NoSuchNodeException.java
+++ b/server/src/main/java/org/opensearch/action/NoSuchNodeException.java
@@ -36,6 +36,11 @@
 
 import java.io.IOException;
 
+/**
+ * Base exception for no node found
+ *
+ * @opensearch.internal
+ */
 public class NoSuchNodeException extends FailedNodeException {
 
     public NoSuchNodeException(String nodeId) {
diff --git a/server/src/main/java/org/opensearch/action/NotifyOnceListener.java b/server/src/main/java/org/opensearch/action/NotifyOnceListener.java
index 4935c34daa284..cc625962e54f6 100644
--- a/server/src/main/java/org/opensearch/action/NotifyOnceListener.java
+++ b/server/src/main/java/org/opensearch/action/NotifyOnceListener.java
@@ -38,6 +38,8 @@
  * A listener that ensures that only one of onResponse or onFailure is called. And the method
  * the is called is only called once. Subclasses should implement notification logic with
  * innerOnResponse and innerOnFailure.
+ *
+ * @opensearch.internal
  */
 public abstract class NotifyOnceListener<Response> implements ActionListener<Response> {
 
diff --git a/server/src/main/java/org/opensearch/action/OriginalIndices.java b/server/src/main/java/org/opensearch/action/OriginalIndices.java
index 759585fb499a0..96103b1eab0e2 100644
--- a/server/src/main/java/org/opensearch/action/OriginalIndices.java
+++ b/server/src/main/java/org/opensearch/action/OriginalIndices.java
@@ -41,6 +41,8 @@
 
 /**
  * Used to keep track of original indices within internal (e.g. shard level) requests
+ *
+ * @opensearch.internal
  */
 public final class OriginalIndices implements IndicesRequest {
 
diff --git a/server/src/main/java/org/opensearch/action/PrimaryMissingActionException.java b/server/src/main/java/org/opensearch/action/PrimaryMissingActionException.java
index 57ae5056d6cd9..95d82d1f43c7b 100644
--- a/server/src/main/java/org/opensearch/action/PrimaryMissingActionException.java
+++ b/server/src/main/java/org/opensearch/action/PrimaryMissingActionException.java
@@ -37,6 +37,11 @@
 
 import java.io.IOException;
 
+/**
+ * Base exception for a missing action on a primary
+ *
+ * @opensearch.internal
+ */
 public class PrimaryMissingActionException extends OpenSearchException {
 
     public PrimaryMissingActionException(String message) {
diff --git a/server/src/main/java/org/opensearch/action/RealtimeRequest.java b/server/src/main/java/org/opensearch/action/RealtimeRequest.java
index 37865a6cbff8d..0ceb79ec903d9 100644
--- a/server/src/main/java/org/opensearch/action/RealtimeRequest.java
+++ b/server/src/main/java/org/opensearch/action/RealtimeRequest.java
@@ -35,6 +35,8 @@
 /**
  * Indicates that a request can execute in realtime (reads from the translog).
  * All {@link ActionRequest} that are realtime should implement this interface.
+ *
+ * @opensearch.internal
  */
 public interface RealtimeRequest {
 
diff --git a/server/src/main/java/org/opensearch/action/RequestValidators.java b/server/src/main/java/org/opensearch/action/RequestValidators.java
index 44245c0906882..d3ec4ba2f0017 100644
--- a/server/src/main/java/org/opensearch/action/RequestValidators.java
+++ b/server/src/main/java/org/opensearch/action/RequestValidators.java
@@ -38,6 +38,11 @@
 import java.util.Collection;
 import java.util.Optional;
 
+/**
+ * Validates transport requests
+ *
+ * @opensearch.internal
+ */
 public class RequestValidators<T extends ActionRequest> {
 
     private final Collection<RequestValidator<T>> validators;
diff --git a/server/src/main/java/org/opensearch/action/RoutingMissingException.java b/server/src/main/java/org/opensearch/action/RoutingMissingException.java
index 4f34a7847da4d..18b2dfb89b381 100644
--- a/server/src/main/java/org/opensearch/action/RoutingMissingException.java
+++ b/server/src/main/java/org/opensearch/action/RoutingMissingException.java
@@ -41,6 +41,11 @@
 import java.io.IOException;
 import java.util.Objects;
 
+/**
+ * Base exception for a missing routing
+ *
+ * @opensearch.internal
+ */
 public class RoutingMissingException extends OpenSearchException {
 
     private final String type;
diff --git a/server/src/main/java/org/opensearch/action/ShardOperationFailedException.java b/server/src/main/java/org/opensearch/action/ShardOperationFailedException.java
index f1f134c19115d..f1d1afc46105e 100644
--- a/server/src/main/java/org/opensearch/action/ShardOperationFailedException.java
+++ b/server/src/main/java/org/opensearch/action/ShardOperationFailedException.java
@@ -42,6 +42,7 @@
 /**
  * An exception indicating that a failure occurred performing an operation on the shard.
  *
+ * @opensearch.internal
  */
 public abstract class ShardOperationFailedException implements Writeable, ToXContentObject {
 
diff --git a/server/src/main/java/org/opensearch/action/StepListener.java b/server/src/main/java/org/opensearch/action/StepListener.java
index 9547494c753c2..b99fe20a46ed8 100644
--- a/server/src/main/java/org/opensearch/action/StepListener.java
+++ b/server/src/main/java/org/opensearch/action/StepListener.java
@@ -61,6 +61,8 @@
  *    }, flowListener::onFailure);
  *  }
  * }</pre>
+ *
+ * @opensearch.internal
  */
 
 public final class StepListener<Response> extends NotifyOnceListener<Response> {
diff --git a/server/src/main/java/org/opensearch/action/TaskOperationFailure.java b/server/src/main/java/org/opensearch/action/TaskOperationFailure.java
index 09895e5f46db4..b2601d9693d83 100644
--- a/server/src/main/java/org/opensearch/action/TaskOperationFailure.java
+++ b/server/src/main/java/org/opensearch/action/TaskOperationFailure.java
@@ -52,6 +52,8 @@
  * Information about task operation failures
  *
  * The class is final due to serialization limitations
+ *
+ * @opensearch.internal
  */
 public final class TaskOperationFailure implements Writeable, ToXContentFragment {
     private static final String TASK_ID = "task_id";
diff --git a/server/src/main/java/org/opensearch/action/ThreadingModel.java b/server/src/main/java/org/opensearch/action/ThreadingModel.java
index 93e96836941e4..11c61152e5107 100644
--- a/server/src/main/java/org/opensearch/action/ThreadingModel.java
+++ b/server/src/main/java/org/opensearch/action/ThreadingModel.java
@@ -32,6 +32,11 @@
 
 package org.opensearch.action;
 
+/**
+ * Threading model
+ *
+ * @opensearch.internal
+ */
 public enum ThreadingModel {
     NONE((byte) 0),
     OPERATION((byte) 1),
diff --git a/server/src/main/java/org/opensearch/action/TimestampParsingException.java b/server/src/main/java/org/opensearch/action/TimestampParsingException.java
index f6a0207f22db7..7cebdccdbef34 100644
--- a/server/src/main/java/org/opensearch/action/TimestampParsingException.java
+++ b/server/src/main/java/org/opensearch/action/TimestampParsingException.java
@@ -38,6 +38,11 @@
 
 import java.io.IOException;
 
+/**
+ * Base exception for a failed timestamp parse
+ *
+ * @opensearch.internal
+ */
 public class TimestampParsingException extends OpenSearchException {
 
     private final String timestamp;
diff --git a/server/src/main/java/org/opensearch/action/TransportActionNodeProxy.java b/server/src/main/java/org/opensearch/action/TransportActionNodeProxy.java
index 8c6838b186fca..a04e89d9a1f8f 100644
--- a/server/src/main/java/org/opensearch/action/TransportActionNodeProxy.java
+++ b/server/src/main/java/org/opensearch/action/TransportActionNodeProxy.java
@@ -39,6 +39,8 @@
 
 /**
  * A generic proxy that will execute the given action against a specific node.
+ *
+ * @opensearch.internal
  */
 public class TransportActionNodeProxy<Request extends ActionRequest, Response extends ActionResponse> {
 
diff --git a/server/src/main/java/org/opensearch/action/UnavailableShardsException.java b/server/src/main/java/org/opensearch/action/UnavailableShardsException.java
index a6050ae9a3c75..75fde3828e904 100644
--- a/server/src/main/java/org/opensearch/action/UnavailableShardsException.java
+++ b/server/src/main/java/org/opensearch/action/UnavailableShardsException.java
@@ -40,6 +40,11 @@
 
 import java.io.IOException;
 
+/**
+ * Base exception for shards unavailable
+ *
+ * @opensearch.internal
+ */
 public class UnavailableShardsException extends OpenSearchException {
 
     public UnavailableShardsException(@Nullable ShardId shardId, String message, Object... args) {
diff --git a/server/src/main/java/org/opensearch/action/ValidateActions.java b/server/src/main/java/org/opensearch/action/ValidateActions.java
index 134a880c7a972..1d1591ae3049b 100644
--- a/server/src/main/java/org/opensearch/action/ValidateActions.java
+++ b/server/src/main/java/org/opensearch/action/ValidateActions.java
@@ -32,6 +32,11 @@
 
 package org.opensearch.action;
 
+/**
+ * Validates transport actions
+ *
+ * @opensearch.internal
+ */
 public class ValidateActions {
 
     public static ActionRequestValidationException addValidationError(String error, ActionRequestValidationException validationException) {
diff --git a/server/src/main/java/org/opensearch/action/bulk/BackoffPolicy.java b/server/src/main/java/org/opensearch/action/bulk/BackoffPolicy.java
index 50acd82ae9002..0b20979c9673e 100644
--- a/server/src/main/java/org/opensearch/action/bulk/BackoffPolicy.java
+++ b/server/src/main/java/org/opensearch/action/bulk/BackoffPolicy.java
@@ -53,6 +53,8 @@
  * </ul>
  *
  * Note that backoff policies are exposed as <code>Iterables</code> in order to be consumed multiple times.
+ *
+ * @opensearch.internal
  */
 public abstract class BackoffPolicy implements Iterable<TimeValue> {
     private static final BackoffPolicy NO_BACKOFF = new NoBackoff();
diff --git a/server/src/main/java/org/opensearch/action/bulk/BulkAction.java b/server/src/main/java/org/opensearch/action/bulk/BulkAction.java
index 031c8efa8cb84..f80ec32628b8a 100644
--- a/server/src/main/java/org/opensearch/action/bulk/BulkAction.java
+++ b/server/src/main/java/org/opensearch/action/bulk/BulkAction.java
@@ -36,6 +36,11 @@
 import org.opensearch.common.settings.Settings;
 import org.opensearch.transport.TransportRequestOptions;
 
+/**
+ * Transport action for bulk indexing
+ *
+ * @opensearch.internal
+ */
 public class BulkAction extends ActionType<BulkResponse> {
 
     public static final BulkAction INSTANCE = new BulkAction();
diff --git a/server/src/main/java/org/opensearch/action/bulk/BulkItemRequest.java b/server/src/main/java/org/opensearch/action/bulk/BulkItemRequest.java
index 2002d5864e966..f39ba589a3019 100644
--- a/server/src/main/java/org/opensearch/action/bulk/BulkItemRequest.java
+++ b/server/src/main/java/org/opensearch/action/bulk/BulkItemRequest.java
@@ -45,6 +45,11 @@
 import java.io.IOException;
 import java.util.Objects;
 
+/**
+ * Transport request for a Single bulk item
+ *
+ * @opensearch.internal
+ */
 public class BulkItemRequest implements Writeable, Accountable {
 
     private static final long SHALLOW_SIZE = RamUsageEstimator.shallowSizeOfInstance(BulkItemRequest.class);
diff --git a/server/src/main/java/org/opensearch/action/bulk/BulkItemResponse.java b/server/src/main/java/org/opensearch/action/bulk/BulkItemResponse.java
index fdb27a00bac2d..e3252988c3b35 100644
--- a/server/src/main/java/org/opensearch/action/bulk/BulkItemResponse.java
+++ b/server/src/main/java/org/opensearch/action/bulk/BulkItemResponse.java
@@ -67,6 +67,8 @@
 /**
  * Represents a single item response for an action executed as part of the bulk API. Holds the index/type/id
  * of the relevant action, and if it has failed or not (with the failure message in case it failed).
+ *
+ * @opensearch.internal
  */
 public class BulkItemResponse implements Writeable, StatusToXContentObject {
 
diff --git a/server/src/main/java/org/opensearch/action/bulk/BulkPrimaryExecutionContext.java b/server/src/main/java/org/opensearch/action/bulk/BulkPrimaryExecutionContext.java
index da8833fe49a29..4dcc14529aa37 100644
--- a/server/src/main/java/org/opensearch/action/bulk/BulkPrimaryExecutionContext.java
+++ b/server/src/main/java/org/opensearch/action/bulk/BulkPrimaryExecutionContext.java
@@ -48,6 +48,8 @@
  * This is a utility class that holds the per request state needed to perform bulk operations on the primary.
  * More specifically, it maintains an index to the current executing bulk item, which allows execution
  * to stop and wait for external events such as mapping updates.
+ *
+ * @opensearch.internal
  */
 class BulkPrimaryExecutionContext {
 
diff --git a/server/src/main/java/org/opensearch/action/bulk/BulkProcessor.java b/server/src/main/java/org/opensearch/action/bulk/BulkProcessor.java
index 90a177119cfd8..166c4a535aaad 100644
--- a/server/src/main/java/org/opensearch/action/bulk/BulkProcessor.java
+++ b/server/src/main/java/org/opensearch/action/bulk/BulkProcessor.java
@@ -63,6 +63,8 @@
  * requests allowed to be executed in parallel.
  * <p>
  * In order to create a new bulk processor, use the {@link Builder}.
+ *
+ * @opensearch.internal
  */
 public class BulkProcessor implements Closeable {
 
diff --git a/server/src/main/java/org/opensearch/action/bulk/BulkRequest.java b/server/src/main/java/org/opensearch/action/bulk/BulkRequest.java
index e3bf5bced5072..25b335eae0bf1 100644
--- a/server/src/main/java/org/opensearch/action/bulk/BulkRequest.java
+++ b/server/src/main/java/org/opensearch/action/bulk/BulkRequest.java
@@ -70,6 +70,8 @@
  *
  * Note that we only support refresh on the bulk request not per item.
  * @see org.opensearch.client.Client#bulk(BulkRequest)
+ *
+ * @opensearch.internal
  */
 public class BulkRequest extends ActionRequest implements CompositeIndicesRequest, WriteRequest<BulkRequest>, Accountable {
 
diff --git a/server/src/main/java/org/opensearch/action/bulk/BulkRequestBuilder.java b/server/src/main/java/org/opensearch/action/bulk/BulkRequestBuilder.java
index c58877e48a7eb..d2e0d558fcc1b 100644
--- a/server/src/main/java/org/opensearch/action/bulk/BulkRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/bulk/BulkRequestBuilder.java
@@ -50,6 +50,8 @@
 /**
  * A bulk request holds an ordered {@link IndexRequest}s and {@link DeleteRequest}s and allows to executes
  * it in a single batch.
+ *
+ * @opensearch.internal
  */
 public class BulkRequestBuilder extends ActionRequestBuilder<BulkRequest, BulkResponse> implements WriteRequestBuilder<BulkRequestBuilder> {
 
diff --git a/server/src/main/java/org/opensearch/action/bulk/BulkRequestHandler.java b/server/src/main/java/org/opensearch/action/bulk/BulkRequestHandler.java
index 5b4ec5cf8679a..541d29102ecd2 100644
--- a/server/src/main/java/org/opensearch/action/bulk/BulkRequestHandler.java
+++ b/server/src/main/java/org/opensearch/action/bulk/BulkRequestHandler.java
@@ -44,6 +44,8 @@
 
 /**
  * Implements the low-level details of bulk request handling
+ *
+ * @opensearch.internal
  */
 public final class BulkRequestHandler {
     private final Logger logger;
diff --git a/server/src/main/java/org/opensearch/action/bulk/BulkRequestParser.java b/server/src/main/java/org/opensearch/action/bulk/BulkRequestParser.java
index 042e104f70c7f..675905cc60e75 100644
--- a/server/src/main/java/org/opensearch/action/bulk/BulkRequestParser.java
+++ b/server/src/main/java/org/opensearch/action/bulk/BulkRequestParser.java
@@ -61,6 +61,8 @@
 
 /**
  * Helper to parse bulk requests. This should be considered an internal class.
+ *
+ * @opensearch.internal
  */
 public final class BulkRequestParser {
 
diff --git a/server/src/main/java/org/opensearch/action/bulk/BulkResponse.java b/server/src/main/java/org/opensearch/action/bulk/BulkResponse.java
index 751ad567c8639..6dec144f2ccf0 100644
--- a/server/src/main/java/org/opensearch/action/bulk/BulkResponse.java
+++ b/server/src/main/java/org/opensearch/action/bulk/BulkResponse.java
@@ -55,6 +55,8 @@
  * A response of a bulk execution. Holding a response for each item responding (in order) of the
  * bulk requests. Each item holds the index/type/id is operated on, and if it failed or not (with the
  * failure message).
+ *
+ * @opensearch.internal
  */
 public class BulkResponse extends ActionResponse implements Iterable<BulkItemResponse>, StatusToXContentObject {
 
diff --git a/server/src/main/java/org/opensearch/action/bulk/BulkShardRequest.java b/server/src/main/java/org/opensearch/action/bulk/BulkShardRequest.java
index b082395263875..a7d0de98981ba 100644
--- a/server/src/main/java/org/opensearch/action/bulk/BulkShardRequest.java
+++ b/server/src/main/java/org/opensearch/action/bulk/BulkShardRequest.java
@@ -47,6 +47,11 @@
 import java.util.Set;
 import java.util.stream.Stream;
 
+/**
+ * A bulk shard request targeting a specific shard ID
+ *
+ * @opensearch.internal
+ */
 public class BulkShardRequest extends ReplicatedWriteRequest<BulkShardRequest> implements Accountable {
 
     public static final Version COMPACT_SHARD_ID_VERSION = LegacyESVersion.V_7_9_0;
diff --git a/server/src/main/java/org/opensearch/action/bulk/BulkShardResponse.java b/server/src/main/java/org/opensearch/action/bulk/BulkShardResponse.java
index 18d954a4feb23..b96ebcb3a3c0a 100644
--- a/server/src/main/java/org/opensearch/action/bulk/BulkShardResponse.java
+++ b/server/src/main/java/org/opensearch/action/bulk/BulkShardResponse.java
@@ -43,6 +43,11 @@
 
 import java.io.IOException;
 
+/**
+ * Transport response for a bulk shard request
+ *
+ * @opensearch.internal
+ */
 public class BulkShardResponse extends ReplicationResponse implements WriteResponse {
 
     private static final Version COMPACT_SHARD_ID_VERSION = LegacyESVersion.V_7_9_0;
diff --git a/server/src/main/java/org/opensearch/action/bulk/MappingUpdatePerformer.java b/server/src/main/java/org/opensearch/action/bulk/MappingUpdatePerformer.java
index c0eb29e4c112f..620a3f0e3691f 100644
--- a/server/src/main/java/org/opensearch/action/bulk/MappingUpdatePerformer.java
+++ b/server/src/main/java/org/opensearch/action/bulk/MappingUpdatePerformer.java
@@ -36,6 +36,11 @@
 import org.opensearch.index.mapper.Mapping;
 import org.opensearch.index.shard.ShardId;
 
+/**
+ * Updates the mappings on the cluster manager
+ *
+ * @opensearch.internal
+ */
 public interface MappingUpdatePerformer {
 
     /**
diff --git a/server/src/main/java/org/opensearch/action/bulk/Retry.java b/server/src/main/java/org/opensearch/action/bulk/Retry.java
index bb1197699d894..9c7e8cd685b28 100644
--- a/server/src/main/java/org/opensearch/action/bulk/Retry.java
+++ b/server/src/main/java/org/opensearch/action/bulk/Retry.java
@@ -49,6 +49,8 @@
 
 /**
  * Encapsulates synchronous and asynchronous retry logic.
+ *
+ * @opensearch.internal
  */
 public class Retry {
     private final BackoffPolicy backoffPolicy;
diff --git a/server/src/main/java/org/opensearch/action/bulk/TransportBulkAction.java b/server/src/main/java/org/opensearch/action/bulk/TransportBulkAction.java
index 560fd1d8a45b3..e557b6c8e897e 100644
--- a/server/src/main/java/org/opensearch/action/bulk/TransportBulkAction.java
+++ b/server/src/main/java/org/opensearch/action/bulk/TransportBulkAction.java
@@ -112,6 +112,8 @@
 /**
  * Groups bulk request items by shard, optionally creating non-existent indices and
  * delegates to {@link TransportShardBulkAction} for shard-level bulk execution
+ *
+ * @opensearch.internal
  */
 public class TransportBulkAction extends HandledTransportAction<BulkRequest, BulkResponse> {
 
diff --git a/server/src/main/java/org/opensearch/action/bulk/TransportShardBulkAction.java b/server/src/main/java/org/opensearch/action/bulk/TransportShardBulkAction.java
index cc9f20b7aa256..bbc33edce2b9e 100644
--- a/server/src/main/java/org/opensearch/action/bulk/TransportShardBulkAction.java
+++ b/server/src/main/java/org/opensearch/action/bulk/TransportShardBulkAction.java
@@ -94,7 +94,11 @@
 import java.util.function.Function;
 import java.util.function.LongSupplier;
 
-/** Performs shard-level bulk (index, delete or update) operations */
+/**
+ * Performs shard-level bulk (index, delete or update) operations
+ *
+ * @opensearch.internal
+ */
 public class TransportShardBulkAction extends TransportWriteAction<BulkShardRequest, BulkShardRequest, BulkShardResponse> {
 
     public static final String ACTION_NAME = BulkAction.NAME + "[s]";
diff --git a/server/src/main/java/org/opensearch/action/bulk/TransportSingleItemBulkWriteAction.java b/server/src/main/java/org/opensearch/action/bulk/TransportSingleItemBulkWriteAction.java
index a833687d591de..e5f96fdab9c96 100644
--- a/server/src/main/java/org/opensearch/action/bulk/TransportSingleItemBulkWriteAction.java
+++ b/server/src/main/java/org/opensearch/action/bulk/TransportSingleItemBulkWriteAction.java
@@ -45,7 +45,11 @@
 import org.opensearch.tasks.Task;
 import org.opensearch.transport.TransportService;
 
-/** use transport bulk action directly */
+/**
+ * use transport bulk action directly
+ *
+ * @opensearch.internal
+ */
 @Deprecated
 public abstract class TransportSingleItemBulkWriteAction<
     Request extends ReplicatedWriteRequest<Request>,
diff --git a/server/src/main/java/org/opensearch/action/delete/DeleteAction.java b/server/src/main/java/org/opensearch/action/delete/DeleteAction.java
index dc58ebee6c356..b93867ca12efe 100644
--- a/server/src/main/java/org/opensearch/action/delete/DeleteAction.java
+++ b/server/src/main/java/org/opensearch/action/delete/DeleteAction.java
@@ -34,6 +34,11 @@
 
 import org.opensearch.action.ActionType;
 
+/**
+ * Transport action to delete a document from an index
+ *
+ * @opensearch.internal
+ */
 public class DeleteAction extends ActionType<DeleteResponse> {
 
     public static final DeleteAction INSTANCE = new DeleteAction();
diff --git a/server/src/main/java/org/opensearch/action/delete/DeleteRequest.java b/server/src/main/java/org/opensearch/action/delete/DeleteRequest.java
index c40933ba9c92e..ce723df0c383a 100644
--- a/server/src/main/java/org/opensearch/action/delete/DeleteRequest.java
+++ b/server/src/main/java/org/opensearch/action/delete/DeleteRequest.java
@@ -64,6 +64,8 @@
  * @see DeleteResponse
  * @see org.opensearch.client.Client#delete(DeleteRequest)
  * @see org.opensearch.client.Requests#deleteRequest(String)
+ *
+ * @opensearch.internal
  */
 public class DeleteRequest extends ReplicatedWriteRequest<DeleteRequest>
     implements
diff --git a/server/src/main/java/org/opensearch/action/delete/DeleteRequestBuilder.java b/server/src/main/java/org/opensearch/action/delete/DeleteRequestBuilder.java
index f6ee0f4a7b278..0436962ce01d2 100644
--- a/server/src/main/java/org/opensearch/action/delete/DeleteRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/delete/DeleteRequestBuilder.java
@@ -40,6 +40,8 @@
 
 /**
  * A delete document action request builder.
+ *
+ * @opensearch.internal
  */
 public class DeleteRequestBuilder extends ReplicationRequestBuilder<DeleteRequest, DeleteResponse, DeleteRequestBuilder>
     implements
diff --git a/server/src/main/java/org/opensearch/action/delete/DeleteResponse.java b/server/src/main/java/org/opensearch/action/delete/DeleteResponse.java
index 6b000561ad282..1d53524cd6c63 100644
--- a/server/src/main/java/org/opensearch/action/delete/DeleteResponse.java
+++ b/server/src/main/java/org/opensearch/action/delete/DeleteResponse.java
@@ -47,6 +47,8 @@
  *
  * @see org.opensearch.action.delete.DeleteRequest
  * @see org.opensearch.client.Client#delete(DeleteRequest)
+ *
+ * @opensearch.internal
  */
 public class DeleteResponse extends DocWriteResponse {
 
diff --git a/server/src/main/java/org/opensearch/action/delete/TransportDeleteAction.java b/server/src/main/java/org/opensearch/action/delete/TransportDeleteAction.java
index adeebcba28a89..039214459ac21 100644
--- a/server/src/main/java/org/opensearch/action/delete/TransportDeleteAction.java
+++ b/server/src/main/java/org/opensearch/action/delete/TransportDeleteAction.java
@@ -42,6 +42,8 @@
  * Performs the delete operation.
  *
  * Deprecated use TransportBulkAction with a single item instead
+ *
+ * @opensearch.internal
  */
 @Deprecated
 public class TransportDeleteAction extends TransportSingleItemBulkWriteAction<DeleteRequest, DeleteResponse> {
diff --git a/server/src/main/java/org/opensearch/action/explain/ExplainAction.java b/server/src/main/java/org/opensearch/action/explain/ExplainAction.java
index ff534dbf82f6d..e955ecc8a1e45 100644
--- a/server/src/main/java/org/opensearch/action/explain/ExplainAction.java
+++ b/server/src/main/java/org/opensearch/action/explain/ExplainAction.java
@@ -36,6 +36,8 @@
 
 /**
  * Entry point for the explain feature.
+ *
+ * @opensearch.internal
  */
 public class ExplainAction extends ActionType<ExplainResponse> {
 
diff --git a/server/src/main/java/org/opensearch/action/explain/ExplainRequest.java b/server/src/main/java/org/opensearch/action/explain/ExplainRequest.java
index 1543c2c95b269..8abdff55a82cc 100644
--- a/server/src/main/java/org/opensearch/action/explain/ExplainRequest.java
+++ b/server/src/main/java/org/opensearch/action/explain/ExplainRequest.java
@@ -53,6 +53,8 @@
 
 /**
  * Explain request encapsulating the explain query and document identifier to get an explanation for.
+ *
+ * @opensearch.internal
  */
 public class ExplainRequest extends SingleShardRequest<ExplainRequest> implements ToXContentObject {
 
diff --git a/server/src/main/java/org/opensearch/action/explain/ExplainRequestBuilder.java b/server/src/main/java/org/opensearch/action/explain/ExplainRequestBuilder.java
index 6839479079845..a582b29346665 100644
--- a/server/src/main/java/org/opensearch/action/explain/ExplainRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/explain/ExplainRequestBuilder.java
@@ -41,6 +41,8 @@
 
 /**
  * A builder for {@link ExplainRequest}.
+ *
+ * @opensearch.internal
  */
 public class ExplainRequestBuilder extends SingleShardOperationRequestBuilder<ExplainRequest, ExplainResponse, ExplainRequestBuilder> {
 
diff --git a/server/src/main/java/org/opensearch/action/explain/ExplainResponse.java b/server/src/main/java/org/opensearch/action/explain/ExplainResponse.java
index 6dd1945a38ffc..eca7add66047c 100644
--- a/server/src/main/java/org/opensearch/action/explain/ExplainResponse.java
+++ b/server/src/main/java/org/opensearch/action/explain/ExplainResponse.java
@@ -55,6 +55,8 @@
 
 /**
  * Response containing the score explanation.
+ *
+ * @opensearch.internal
  */
 public class ExplainResponse extends ActionResponse implements StatusToXContentObject {
 
diff --git a/server/src/main/java/org/opensearch/action/explain/TransportExplainAction.java b/server/src/main/java/org/opensearch/action/explain/TransportExplainAction.java
index 9fb16eec7d36b..5752860af4f16 100644
--- a/server/src/main/java/org/opensearch/action/explain/TransportExplainAction.java
+++ b/server/src/main/java/org/opensearch/action/explain/TransportExplainAction.java
@@ -68,6 +68,8 @@
 
 /**
  * Explain transport action. Computes the explain on the targeted shard.
+ *
+ * @opensearch.internal
  */
 // TODO: AggregatedDfs. Currently the idf can be different then when executing a normal search with explain.
 public class TransportExplainAction extends TransportSingleShardAction<ExplainRequest, ExplainResponse> {
diff --git a/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilities.java b/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilities.java
index ffc059f08c70f..67fab82949c24 100644
--- a/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilities.java
+++ b/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilities.java
@@ -59,6 +59,8 @@
 
 /**
  * Describes the capabilities of a field optionally merged across multiple indices.
+ *
+ * @opensearch.internal
  */
 public class FieldCapabilities implements Writeable, ToXContentObject {
 
diff --git a/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilitiesAction.java b/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilitiesAction.java
index d10fa5ee69811..e8585e60c8ffd 100644
--- a/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilitiesAction.java
+++ b/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilitiesAction.java
@@ -34,6 +34,11 @@
 
 import org.opensearch.action.ActionType;
 
+/**
+ * Transport action for a field capabilities request
+ *
+ * @opensearch.internal
+ */
 public class FieldCapabilitiesAction extends ActionType<FieldCapabilitiesResponse> {
 
     public static final FieldCapabilitiesAction INSTANCE = new FieldCapabilitiesAction();
diff --git a/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilitiesIndexRequest.java b/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilitiesIndexRequest.java
index b349d8e2ca26f..3cfd21087582d 100644
--- a/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilitiesIndexRequest.java
+++ b/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilitiesIndexRequest.java
@@ -46,6 +46,11 @@
 import java.io.IOException;
 import java.util.Objects;
 
+/**
+ * Transport Request for Retrieving Field Capabilities for an Index
+ *
+ * @opensearch.internal
+ */
 public class FieldCapabilitiesIndexRequest extends ActionRequest implements IndicesRequest {
 
     public static final IndicesOptions INDICES_OPTIONS = IndicesOptions.strictSingleIndexNoExpandForbidClosed();
diff --git a/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilitiesIndexResponse.java b/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilitiesIndexResponse.java
index 0d7fd91a6bfd8..9225e0cdc6571 100644
--- a/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilitiesIndexResponse.java
+++ b/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilitiesIndexResponse.java
@@ -44,6 +44,8 @@
 
 /**
  * Response for {@link TransportFieldCapabilitiesIndexAction}.
+ *
+ * @opensearch.internal
  */
 public class FieldCapabilitiesIndexResponse extends ActionResponse implements Writeable {
     private final String indexName;
diff --git a/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilitiesRequest.java b/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilitiesRequest.java
index c8391fddf564d..688568ba9a6d6 100644
--- a/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilitiesRequest.java
+++ b/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilitiesRequest.java
@@ -51,6 +51,9 @@
 import java.util.Objects;
 import java.util.Set;
 
+/**
+ * Transport request for retrieving field capabilities for an explicit list of fields
+ */
 public final class FieldCapabilitiesRequest extends ActionRequest implements IndicesRequest.Replaceable, ToXContentObject {
     public static final String NAME = "field_caps_request";
 
diff --git a/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilitiesRequestBuilder.java b/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilitiesRequestBuilder.java
index 3c1f11c047ef4..70a90b98bdf25 100644
--- a/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilitiesRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilitiesRequestBuilder.java
@@ -36,6 +36,11 @@
 import org.opensearch.client.OpenSearchClient;
 import org.opensearch.index.query.QueryBuilder;
 
+/**
+ * Transport request builder for retrieving field capabilities
+ *
+ * @opensearch.internal
+ */
 public class FieldCapabilitiesRequestBuilder extends ActionRequestBuilder<FieldCapabilitiesRequest, FieldCapabilitiesResponse> {
     public FieldCapabilitiesRequestBuilder(OpenSearchClient client, FieldCapabilitiesAction action, String... indices) {
         super(client, action, new FieldCapabilitiesRequest().indices(indices));
diff --git a/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilitiesResponse.java b/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilitiesResponse.java
index 90b35d6e14e4e..e5f644987182c 100644
--- a/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilitiesResponse.java
+++ b/server/src/main/java/org/opensearch/action/fieldcaps/FieldCapabilitiesResponse.java
@@ -56,6 +56,8 @@
 
 /**
  * Response for {@link FieldCapabilitiesRequest} requests.
+ *
+ * @opensearch.internal
  */
 public class FieldCapabilitiesResponse extends ActionResponse implements ToXContentObject {
     private static final ParseField INDICES_FIELD = new ParseField("indices");
diff --git a/server/src/main/java/org/opensearch/action/fieldcaps/IndexFieldCapabilities.java b/server/src/main/java/org/opensearch/action/fieldcaps/IndexFieldCapabilities.java
index d0629a46c9d4a..062e5bc1af7e5 100644
--- a/server/src/main/java/org/opensearch/action/fieldcaps/IndexFieldCapabilities.java
+++ b/server/src/main/java/org/opensearch/action/fieldcaps/IndexFieldCapabilities.java
@@ -46,6 +46,8 @@
 
 /**
  * Describes the capabilities of a field in a single index.
+ *
+ * @opensearch.internal
  */
 public class IndexFieldCapabilities implements Writeable {
 
diff --git a/server/src/main/java/org/opensearch/action/fieldcaps/TransportFieldCapabilitiesAction.java b/server/src/main/java/org/opensearch/action/fieldcaps/TransportFieldCapabilitiesAction.java
index 07254db46d567..2d669a5f1aad9 100644
--- a/server/src/main/java/org/opensearch/action/fieldcaps/TransportFieldCapabilitiesAction.java
+++ b/server/src/main/java/org/opensearch/action/fieldcaps/TransportFieldCapabilitiesAction.java
@@ -58,6 +58,11 @@
 import java.util.Map;
 import java.util.Set;
 
+/**
+ * Transport action for field capabilities requests
+ *
+ * @opensearch.internal
+ */
 public class TransportFieldCapabilitiesAction extends HandledTransportAction<FieldCapabilitiesRequest, FieldCapabilitiesResponse> {
     private final ThreadPool threadPool;
     private final ClusterService clusterService;
diff --git a/server/src/main/java/org/opensearch/action/fieldcaps/TransportFieldCapabilitiesIndexAction.java b/server/src/main/java/org/opensearch/action/fieldcaps/TransportFieldCapabilitiesIndexAction.java
index a4807eff1acb4..9b42bc12f82a7 100644
--- a/server/src/main/java/org/opensearch/action/fieldcaps/TransportFieldCapabilitiesIndexAction.java
+++ b/server/src/main/java/org/opensearch/action/fieldcaps/TransportFieldCapabilitiesIndexAction.java
@@ -85,6 +85,11 @@
 
 import static org.opensearch.action.support.TransportActions.isShardNotAvailableException;
 
+/**
+ * Transport action for field capabilities request in an index
+ *
+ * @opensearch.internal
+ */
 public class TransportFieldCapabilitiesIndexAction extends HandledTransportAction<
     FieldCapabilitiesIndexRequest,
     FieldCapabilitiesIndexResponse> {
diff --git a/server/src/main/java/org/opensearch/action/get/GetAction.java b/server/src/main/java/org/opensearch/action/get/GetAction.java
index f90fbc9b3be1c..05544591f030e 100644
--- a/server/src/main/java/org/opensearch/action/get/GetAction.java
+++ b/server/src/main/java/org/opensearch/action/get/GetAction.java
@@ -34,6 +34,11 @@
 
 import org.opensearch.action.ActionType;
 
+/**
+ * Transport action to get a document
+ *
+ * @opensearch.internal
+ */
 public class GetAction extends ActionType<GetResponse> {
 
     public static final GetAction INSTANCE = new GetAction();
diff --git a/server/src/main/java/org/opensearch/action/get/GetRequest.java b/server/src/main/java/org/opensearch/action/get/GetRequest.java
index 9badf2db92f67..5f740ba789bb2 100644
--- a/server/src/main/java/org/opensearch/action/get/GetRequest.java
+++ b/server/src/main/java/org/opensearch/action/get/GetRequest.java
@@ -60,6 +60,8 @@
  * @see GetResponse
  * @see org.opensearch.client.Requests#getRequest(String)
  * @see org.opensearch.client.Client#get(GetRequest)
+ *
+ * @opensearch.internal
  */
 public class GetRequest extends SingleShardRequest<GetRequest> implements RealtimeRequest {
 
diff --git a/server/src/main/java/org/opensearch/action/get/GetRequestBuilder.java b/server/src/main/java/org/opensearch/action/get/GetRequestBuilder.java
index 492a88b9d3821..078c32adeb7c9 100644
--- a/server/src/main/java/org/opensearch/action/get/GetRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/get/GetRequestBuilder.java
@@ -41,6 +41,8 @@
 
 /**
  * A get document action request builder.
+ *
+ * @opensearch.internal
  */
 public class GetRequestBuilder extends SingleShardOperationRequestBuilder<GetRequest, GetResponse, GetRequestBuilder> {
 
diff --git a/server/src/main/java/org/opensearch/action/get/GetResponse.java b/server/src/main/java/org/opensearch/action/get/GetResponse.java
index a15607d696195..1118c3bb64f95 100644
--- a/server/src/main/java/org/opensearch/action/get/GetResponse.java
+++ b/server/src/main/java/org/opensearch/action/get/GetResponse.java
@@ -56,6 +56,8 @@
  *
  * @see GetRequest
  * @see org.opensearch.client.Client#get(GetRequest)
+ *
+ * @opensearch.internal
  */
 public class GetResponse extends ActionResponse implements Iterable<DocumentField>, ToXContentObject {
 
diff --git a/server/src/main/java/org/opensearch/action/get/MultiGetAction.java b/server/src/main/java/org/opensearch/action/get/MultiGetAction.java
index f7df277585250..bed5d0bd9e55e 100644
--- a/server/src/main/java/org/opensearch/action/get/MultiGetAction.java
+++ b/server/src/main/java/org/opensearch/action/get/MultiGetAction.java
@@ -34,6 +34,11 @@
 
 import org.opensearch.action.ActionType;
 
+/**
+ * Transport action for a multi get
+ *
+ * @opensearch.internal
+ */
 public class MultiGetAction extends ActionType<MultiGetResponse> {
 
     public static final MultiGetAction INSTANCE = new MultiGetAction();
diff --git a/server/src/main/java/org/opensearch/action/get/MultiGetItemResponse.java b/server/src/main/java/org/opensearch/action/get/MultiGetItemResponse.java
index 1ff684fcc5872..dcc296c4b6e0b 100644
--- a/server/src/main/java/org/opensearch/action/get/MultiGetItemResponse.java
+++ b/server/src/main/java/org/opensearch/action/get/MultiGetItemResponse.java
@@ -40,6 +40,8 @@
 
 /**
  * A single multi get response.
+ *
+ * @opensearch.internal
  */
 public class MultiGetItemResponse implements Writeable {
 
diff --git a/server/src/main/java/org/opensearch/action/get/MultiGetRequest.java b/server/src/main/java/org/opensearch/action/get/MultiGetRequest.java
index 974799dd7bf4c..1196b2f065312 100644
--- a/server/src/main/java/org/opensearch/action/get/MultiGetRequest.java
+++ b/server/src/main/java/org/opensearch/action/get/MultiGetRequest.java
@@ -66,6 +66,11 @@
 import java.util.List;
 import java.util.Locale;
 
+/**
+ * Transport request for a multi get.
+ *
+ * @opensearch.internal
+ */
 public class MultiGetRequest extends ActionRequest
     implements
         Iterable<MultiGetRequest.Item>,
diff --git a/server/src/main/java/org/opensearch/action/get/MultiGetRequestBuilder.java b/server/src/main/java/org/opensearch/action/get/MultiGetRequestBuilder.java
index 56ac6cbd1b8c9..c317edc07da8b 100644
--- a/server/src/main/java/org/opensearch/action/get/MultiGetRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/get/MultiGetRequestBuilder.java
@@ -37,6 +37,8 @@
 
 /**
  * A multi get document action request builder.
+ *
+ * @opensearch.internal
  */
 public class MultiGetRequestBuilder extends ActionRequestBuilder<MultiGetRequest, MultiGetResponse> {
 
diff --git a/server/src/main/java/org/opensearch/action/get/MultiGetResponse.java b/server/src/main/java/org/opensearch/action/get/MultiGetResponse.java
index ca6249861dd50..674fd73650da1 100644
--- a/server/src/main/java/org/opensearch/action/get/MultiGetResponse.java
+++ b/server/src/main/java/org/opensearch/action/get/MultiGetResponse.java
@@ -52,6 +52,11 @@
 import java.util.Iterator;
 import java.util.List;
 
+/**
+ * Transport response for a multi get.
+ *
+ * @opensearch.internal
+ */
 public class MultiGetResponse extends ActionResponse implements Iterable<MultiGetItemResponse>, ToXContentObject {
 
     private static final ParseField INDEX = new ParseField("_index");
diff --git a/server/src/main/java/org/opensearch/action/get/MultiGetShardRequest.java b/server/src/main/java/org/opensearch/action/get/MultiGetShardRequest.java
index 3f678d6db2407..9f137b9fdedf2 100644
--- a/server/src/main/java/org/opensearch/action/get/MultiGetShardRequest.java
+++ b/server/src/main/java/org/opensearch/action/get/MultiGetShardRequest.java
@@ -42,6 +42,11 @@
 import java.util.ArrayList;
 import java.util.List;
 
+/**
+ * Multi get shards.
+ *
+ * @opensearch.internal
+ */
 public class MultiGetShardRequest extends SingleShardRequest<MultiGetShardRequest> {
 
     private int shardId;
diff --git a/server/src/main/java/org/opensearch/action/get/MultiGetShardResponse.java b/server/src/main/java/org/opensearch/action/get/MultiGetShardResponse.java
index 2393fa4749876..069f9875185f8 100644
--- a/server/src/main/java/org/opensearch/action/get/MultiGetShardResponse.java
+++ b/server/src/main/java/org/opensearch/action/get/MultiGetShardResponse.java
@@ -41,6 +41,11 @@
 import java.util.ArrayList;
 import java.util.List;
 
+/**
+ * Transport response for multi get shards.
+ *
+ * @opensearch.internal
+ */
 public class MultiGetShardResponse extends ActionResponse {
 
     final IntArrayList locations;
diff --git a/server/src/main/java/org/opensearch/action/get/TransportGetAction.java b/server/src/main/java/org/opensearch/action/get/TransportGetAction.java
index 999cc8c12190b..6d6798fb64178 100644
--- a/server/src/main/java/org/opensearch/action/get/TransportGetAction.java
+++ b/server/src/main/java/org/opensearch/action/get/TransportGetAction.java
@@ -54,6 +54,8 @@
 
 /**
  * Performs the get operation.
+ *
+ * @opensearch.internal
  */
 public class TransportGetAction extends TransportSingleShardAction<GetRequest, GetResponse> {
 
diff --git a/server/src/main/java/org/opensearch/action/get/TransportMultiGetAction.java b/server/src/main/java/org/opensearch/action/get/TransportMultiGetAction.java
index 33f1e559a072c..1e0566e23fff4 100644
--- a/server/src/main/java/org/opensearch/action/get/TransportMultiGetAction.java
+++ b/server/src/main/java/org/opensearch/action/get/TransportMultiGetAction.java
@@ -50,6 +50,11 @@
 import java.util.Map;
 import java.util.concurrent.atomic.AtomicInteger;
 
+/**
+ * Perform the multi get action.
+ *
+ * @opensearch.internal
+ */
 public class TransportMultiGetAction extends HandledTransportAction<MultiGetRequest, MultiGetResponse> {
 
     private final ClusterService clusterService;
diff --git a/server/src/main/java/org/opensearch/action/get/TransportShardMultiGetAction.java b/server/src/main/java/org/opensearch/action/get/TransportShardMultiGetAction.java
index db35af9c3e20f..e882ffdc8c344 100644
--- a/server/src/main/java/org/opensearch/action/get/TransportShardMultiGetAction.java
+++ b/server/src/main/java/org/opensearch/action/get/TransportShardMultiGetAction.java
@@ -53,6 +53,11 @@
 
 import java.io.IOException;
 
+/**
+ * Perform the shard multi get action
+ *
+ * @opensearch.internal
+ */
 public class TransportShardMultiGetAction extends TransportSingleShardAction<MultiGetShardRequest, MultiGetShardResponse> {
 
     private static final String ACTION_NAME = MultiGetAction.NAME + "[shard]";
diff --git a/server/src/main/java/org/opensearch/action/index/IndexAction.java b/server/src/main/java/org/opensearch/action/index/IndexAction.java
index 3f28af9b39d8a..0383cafba2958 100644
--- a/server/src/main/java/org/opensearch/action/index/IndexAction.java
+++ b/server/src/main/java/org/opensearch/action/index/IndexAction.java
@@ -34,6 +34,11 @@
 
 import org.opensearch.action.ActionType;
 
+/**
+ * Transport action for indexing a document.
+ *
+ * @opensearch.internal
+ */
 public class IndexAction extends ActionType<IndexResponse> {
 
     public static final IndexAction INSTANCE = new IndexAction();
diff --git a/server/src/main/java/org/opensearch/action/index/IndexRequest.java b/server/src/main/java/org/opensearch/action/index/IndexRequest.java
index 7bf6b876fa652..f863c4a11340e 100644
--- a/server/src/main/java/org/opensearch/action/index/IndexRequest.java
+++ b/server/src/main/java/org/opensearch/action/index/IndexRequest.java
@@ -88,6 +88,8 @@
  * @see IndexResponse
  * @see org.opensearch.client.Requests#indexRequest(String)
  * @see org.opensearch.client.Client#index(IndexRequest)
+ *
+ * @opensearch.internal
  */
 public class IndexRequest extends ReplicatedWriteRequest<IndexRequest> implements DocWriteRequest<IndexRequest>, CompositeIndicesRequest {
 
diff --git a/server/src/main/java/org/opensearch/action/index/IndexRequestBuilder.java b/server/src/main/java/org/opensearch/action/index/IndexRequestBuilder.java
index cef5ef0f85c62..2902ffd347c6a 100644
--- a/server/src/main/java/org/opensearch/action/index/IndexRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/index/IndexRequestBuilder.java
@@ -46,6 +46,8 @@
 
 /**
  * An index document action request builder.
+ *
+ * @opensearch.internal
  */
 public class IndexRequestBuilder extends ReplicationRequestBuilder<IndexRequest, IndexResponse, IndexRequestBuilder>
     implements
diff --git a/server/src/main/java/org/opensearch/action/index/IndexResponse.java b/server/src/main/java/org/opensearch/action/index/IndexResponse.java
index be0826ce84f96..3ac8246d0c017 100644
--- a/server/src/main/java/org/opensearch/action/index/IndexResponse.java
+++ b/server/src/main/java/org/opensearch/action/index/IndexResponse.java
@@ -48,6 +48,8 @@
  *
  * @see IndexRequest
  * @see org.opensearch.client.Client#index(IndexRequest)
+ *
+ * @opensearch.internal
  */
 public class IndexResponse extends DocWriteResponse {
 
diff --git a/server/src/main/java/org/opensearch/action/index/TransportIndexAction.java b/server/src/main/java/org/opensearch/action/index/TransportIndexAction.java
index dcee695620498..fe4f80bf0c065 100644
--- a/server/src/main/java/org/opensearch/action/index/TransportIndexAction.java
+++ b/server/src/main/java/org/opensearch/action/index/TransportIndexAction.java
@@ -49,6 +49,8 @@
  * </ul>
  *
  * Deprecated use TransportBulkAction with a single item instead
+ *
+ * @opensearch.internal
  */
 @Deprecated
 public class TransportIndexAction extends TransportSingleItemBulkWriteAction<IndexRequest, IndexResponse> {
diff --git a/server/src/main/java/org/opensearch/action/ingest/DeletePipelineAction.java b/server/src/main/java/org/opensearch/action/ingest/DeletePipelineAction.java
index 5ea978db3d5d4..6017be9747912 100644
--- a/server/src/main/java/org/opensearch/action/ingest/DeletePipelineAction.java
+++ b/server/src/main/java/org/opensearch/action/ingest/DeletePipelineAction.java
@@ -35,6 +35,11 @@
 import org.opensearch.action.ActionType;
 import org.opensearch.action.support.master.AcknowledgedResponse;
 
+/**
+ * Transport action to delete a pipeline
+ *
+ * @opensearch.internal
+ */
 public class DeletePipelineAction extends ActionType<AcknowledgedResponse> {
 
     public static final DeletePipelineAction INSTANCE = new DeletePipelineAction();
diff --git a/server/src/main/java/org/opensearch/action/ingest/DeletePipelineRequest.java b/server/src/main/java/org/opensearch/action/ingest/DeletePipelineRequest.java
index 98bc125ce40dc..0bd102849eee8 100644
--- a/server/src/main/java/org/opensearch/action/ingest/DeletePipelineRequest.java
+++ b/server/src/main/java/org/opensearch/action/ingest/DeletePipelineRequest.java
@@ -40,6 +40,11 @@
 import java.io.IOException;
 import java.util.Objects;
 
+/**
+ * transport request to delete a pipeline
+ *
+ * @opensearch.internal
+ */
 public class DeletePipelineRequest extends AcknowledgedRequest<DeletePipelineRequest> {
 
     private String id;
diff --git a/server/src/main/java/org/opensearch/action/ingest/DeletePipelineRequestBuilder.java b/server/src/main/java/org/opensearch/action/ingest/DeletePipelineRequestBuilder.java
index 53b5080f414e0..6a2eb494e8d3f 100644
--- a/server/src/main/java/org/opensearch/action/ingest/DeletePipelineRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/ingest/DeletePipelineRequestBuilder.java
@@ -36,6 +36,11 @@
 import org.opensearch.action.support.master.AcknowledgedResponse;
 import org.opensearch.client.OpenSearchClient;
 
+/**
+ * Transport request builder to delete a pipeline
+ *
+ * @opensearch.internal
+ */
 public class DeletePipelineRequestBuilder extends ActionRequestBuilder<DeletePipelineRequest, AcknowledgedResponse> {
 
     public DeletePipelineRequestBuilder(OpenSearchClient client, DeletePipelineAction action) {
diff --git a/server/src/main/java/org/opensearch/action/ingest/DeletePipelineTransportAction.java b/server/src/main/java/org/opensearch/action/ingest/DeletePipelineTransportAction.java
index de2cf1ca74254..62fa2cbc595a6 100644
--- a/server/src/main/java/org/opensearch/action/ingest/DeletePipelineTransportAction.java
+++ b/server/src/main/java/org/opensearch/action/ingest/DeletePipelineTransportAction.java
@@ -48,6 +48,11 @@
 
 import java.io.IOException;
 
+/**
+ * Perform the action of deleting a pipeline
+ *
+ * @opensearch.internal
+ */
 public class DeletePipelineTransportAction extends TransportMasterNodeAction<DeletePipelineRequest, AcknowledgedResponse> {
 
     private final IngestService ingestService;
diff --git a/server/src/main/java/org/opensearch/action/ingest/GetPipelineAction.java b/server/src/main/java/org/opensearch/action/ingest/GetPipelineAction.java
index 33b9d8f09d053..8371d82b8911e 100644
--- a/server/src/main/java/org/opensearch/action/ingest/GetPipelineAction.java
+++ b/server/src/main/java/org/opensearch/action/ingest/GetPipelineAction.java
@@ -34,6 +34,11 @@
 
 import org.opensearch.action.ActionType;
 
+/**
+ * Transport action to get a pipeline
+ *
+ * @opensearch.internal
+ */
 public class GetPipelineAction extends ActionType<GetPipelineResponse> {
 
     public static final GetPipelineAction INSTANCE = new GetPipelineAction();
diff --git a/server/src/main/java/org/opensearch/action/ingest/GetPipelineRequest.java b/server/src/main/java/org/opensearch/action/ingest/GetPipelineRequest.java
index 322fd1b8e1a52..f6ae98a5ea193 100644
--- a/server/src/main/java/org/opensearch/action/ingest/GetPipelineRequest.java
+++ b/server/src/main/java/org/opensearch/action/ingest/GetPipelineRequest.java
@@ -40,6 +40,11 @@
 
 import java.io.IOException;
 
+/**
+ * transport request to get a pipeline
+ *
+ * @opensearch.internal
+ */
 public class GetPipelineRequest extends MasterNodeReadRequest<GetPipelineRequest> {
 
     private String[] ids;
diff --git a/server/src/main/java/org/opensearch/action/ingest/GetPipelineRequestBuilder.java b/server/src/main/java/org/opensearch/action/ingest/GetPipelineRequestBuilder.java
index 45d9abc6b0adc..6ba0d4fbfe2f7 100644
--- a/server/src/main/java/org/opensearch/action/ingest/GetPipelineRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/ingest/GetPipelineRequestBuilder.java
@@ -35,6 +35,11 @@
 import org.opensearch.action.support.master.MasterNodeReadOperationRequestBuilder;
 import org.opensearch.client.OpenSearchClient;
 
+/**
+ * Transport request builder to get a pipeline
+ *
+ * @opensearch.internal
+ */
 public class GetPipelineRequestBuilder extends MasterNodeReadOperationRequestBuilder<
     GetPipelineRequest,
     GetPipelineResponse,
diff --git a/server/src/main/java/org/opensearch/action/ingest/GetPipelineResponse.java b/server/src/main/java/org/opensearch/action/ingest/GetPipelineResponse.java
index bf7dd909e390b..9e1895fc01857 100644
--- a/server/src/main/java/org/opensearch/action/ingest/GetPipelineResponse.java
+++ b/server/src/main/java/org/opensearch/action/ingest/GetPipelineResponse.java
@@ -53,6 +53,11 @@
 
 import static org.opensearch.common.xcontent.XContentParserUtils.ensureExpectedToken;
 
+/**
+ * transport response for getting a pipeline
+ *
+ * @opensearch.internal
+ */
 public class GetPipelineResponse extends ActionResponse implements StatusToXContentObject {
 
     private List<PipelineConfiguration> pipelines;
diff --git a/server/src/main/java/org/opensearch/action/ingest/GetPipelineTransportAction.java b/server/src/main/java/org/opensearch/action/ingest/GetPipelineTransportAction.java
index a62201d097d12..9c7af1cfe3419 100644
--- a/server/src/main/java/org/opensearch/action/ingest/GetPipelineTransportAction.java
+++ b/server/src/main/java/org/opensearch/action/ingest/GetPipelineTransportAction.java
@@ -48,6 +48,11 @@
 
 import java.io.IOException;
 
+/**
+ * Perform the action of getting a pipeline
+ *
+ * @opensearch.internal
+ */
 public class GetPipelineTransportAction extends TransportMasterNodeReadAction<GetPipelineRequest, GetPipelineResponse> {
 
     @Inject
diff --git a/server/src/main/java/org/opensearch/action/ingest/IngestActionForwarder.java b/server/src/main/java/org/opensearch/action/ingest/IngestActionForwarder.java
index 3ab3e3367fc6d..9df82c474c498 100644
--- a/server/src/main/java/org/opensearch/action/ingest/IngestActionForwarder.java
+++ b/server/src/main/java/org/opensearch/action/ingest/IngestActionForwarder.java
@@ -48,6 +48,8 @@
  * A utility for forwarding ingest requests to ingest nodes in a round-robin fashion.
  *
  * TODO: move this into IngestService and make index/bulk actions call that
+ *
+ * @opensearch.internal
  */
 public final class IngestActionForwarder implements ClusterStateApplier {
 
diff --git a/server/src/main/java/org/opensearch/action/ingest/PutPipelineAction.java b/server/src/main/java/org/opensearch/action/ingest/PutPipelineAction.java
index d61a1ae1041cb..1fcbd783d246b 100644
--- a/server/src/main/java/org/opensearch/action/ingest/PutPipelineAction.java
+++ b/server/src/main/java/org/opensearch/action/ingest/PutPipelineAction.java
@@ -35,6 +35,11 @@
 import org.opensearch.action.ActionType;
 import org.opensearch.action.support.master.AcknowledgedResponse;
 
+/**
+ * Transport action to put a new pipeline
+ *
+ * @opensearch.internal
+ */
 public class PutPipelineAction extends ActionType<AcknowledgedResponse> {
 
     public static final PutPipelineAction INSTANCE = new PutPipelineAction();
diff --git a/server/src/main/java/org/opensearch/action/ingest/PutPipelineRequest.java b/server/src/main/java/org/opensearch/action/ingest/PutPipelineRequest.java
index 526da7c4a74dc..d5fbaa46810f7 100644
--- a/server/src/main/java/org/opensearch/action/ingest/PutPipelineRequest.java
+++ b/server/src/main/java/org/opensearch/action/ingest/PutPipelineRequest.java
@@ -44,6 +44,11 @@
 import java.io.IOException;
 import java.util.Objects;
 
+/**
+ * transport request to put a pipeline
+ *
+ * @opensearch.internal
+ */
 public class PutPipelineRequest extends AcknowledgedRequest<PutPipelineRequest> implements ToXContentObject {
 
     private String id;
diff --git a/server/src/main/java/org/opensearch/action/ingest/PutPipelineRequestBuilder.java b/server/src/main/java/org/opensearch/action/ingest/PutPipelineRequestBuilder.java
index 8279e2f3756e9..fec2cdef089e4 100644
--- a/server/src/main/java/org/opensearch/action/ingest/PutPipelineRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/ingest/PutPipelineRequestBuilder.java
@@ -38,6 +38,11 @@
 import org.opensearch.common.bytes.BytesReference;
 import org.opensearch.common.xcontent.XContentType;
 
+/**
+ * Transport request builder to put a pipeline
+ *
+ * @opensearch.internal
+ */
 public class PutPipelineRequestBuilder extends ActionRequestBuilder<PutPipelineRequest, AcknowledgedResponse> {
 
     public PutPipelineRequestBuilder(OpenSearchClient client, PutPipelineAction action) {
diff --git a/server/src/main/java/org/opensearch/action/ingest/PutPipelineTransportAction.java b/server/src/main/java/org/opensearch/action/ingest/PutPipelineTransportAction.java
index 89d1c1efed8a6..6f21744e5df08 100644
--- a/server/src/main/java/org/opensearch/action/ingest/PutPipelineTransportAction.java
+++ b/server/src/main/java/org/opensearch/action/ingest/PutPipelineTransportAction.java
@@ -58,6 +58,11 @@
 
 import static org.opensearch.ingest.IngestService.INGEST_ORIGIN;
 
+/**
+ * Perform the action of putting a pipeline
+ *
+ * @opensearch.internal
+ */
 public class PutPipelineTransportAction extends TransportMasterNodeAction<PutPipelineRequest, AcknowledgedResponse> {
 
     private final IngestService ingestService;
diff --git a/server/src/main/java/org/opensearch/action/ingest/SimulateDocumentBaseResult.java b/server/src/main/java/org/opensearch/action/ingest/SimulateDocumentBaseResult.java
index 10ccb2003969d..2440a1802912b 100644
--- a/server/src/main/java/org/opensearch/action/ingest/SimulateDocumentBaseResult.java
+++ b/server/src/main/java/org/opensearch/action/ingest/SimulateDocumentBaseResult.java
@@ -47,6 +47,8 @@
 
 /**
  * Holds the end result of what a pipeline did to sample document provided via the simulate api.
+ *
+ *
  */
 public final class SimulateDocumentBaseResult implements SimulateDocumentResult {
     private final WriteableIngestDocument ingestDocument;
diff --git a/server/src/main/java/org/opensearch/action/ingest/SimulateDocumentResult.java b/server/src/main/java/org/opensearch/action/ingest/SimulateDocumentResult.java
index 3beaf43d2a1ae..77ee75fcb9663 100644
--- a/server/src/main/java/org/opensearch/action/ingest/SimulateDocumentResult.java
+++ b/server/src/main/java/org/opensearch/action/ingest/SimulateDocumentResult.java
@@ -34,6 +34,11 @@
 import org.opensearch.common.io.stream.Writeable;
 import org.opensearch.common.xcontent.ToXContentObject;
 
+/**
+ * Interface to simulate a document result
+ *
+ * @opensearch.internal
+ */
 public interface SimulateDocumentResult extends Writeable, ToXContentObject {
 
 }
diff --git a/server/src/main/java/org/opensearch/action/ingest/SimulateDocumentVerboseResult.java b/server/src/main/java/org/opensearch/action/ingest/SimulateDocumentVerboseResult.java
index 07d9b628fe35d..591a3e103fccf 100644
--- a/server/src/main/java/org/opensearch/action/ingest/SimulateDocumentVerboseResult.java
+++ b/server/src/main/java/org/opensearch/action/ingest/SimulateDocumentVerboseResult.java
@@ -47,6 +47,8 @@
 /**
  * Holds the result of what a pipeline did to a sample document via the simulate api, but instead of {@link SimulateDocumentBaseResult}
  * this result class holds the intermediate result each processor did to the sample document.
+ *
+ * @opensearch.internal
  */
 public final class SimulateDocumentVerboseResult implements SimulateDocumentResult {
     public static final String PROCESSOR_RESULT_FIELD = "processor_results";
diff --git a/server/src/main/java/org/opensearch/action/ingest/SimulateExecutionService.java b/server/src/main/java/org/opensearch/action/ingest/SimulateExecutionService.java
index 8c620c707b3ac..ae66dafc954f9 100644
--- a/server/src/main/java/org/opensearch/action/ingest/SimulateExecutionService.java
+++ b/server/src/main/java/org/opensearch/action/ingest/SimulateExecutionService.java
@@ -46,6 +46,11 @@
 
 import static org.opensearch.ingest.TrackingResultProcessor.decorate;
 
+/**
+ * Service to simulate pipeline execution
+ *
+ * @opensearch.internal
+ */
 class SimulateExecutionService {
 
     private static final String THREAD_POOL_NAME = ThreadPool.Names.MANAGEMENT;
diff --git a/server/src/main/java/org/opensearch/action/ingest/SimulatePipelineAction.java b/server/src/main/java/org/opensearch/action/ingest/SimulatePipelineAction.java
index 8039a83b5953e..df2cfda778d06 100644
--- a/server/src/main/java/org/opensearch/action/ingest/SimulatePipelineAction.java
+++ b/server/src/main/java/org/opensearch/action/ingest/SimulatePipelineAction.java
@@ -34,6 +34,11 @@
 
 import org.opensearch.action.ActionType;
 
+/**
+ * Transport action to simulate a pipeline
+ *
+ * @opensearch.internal
+ */
 public class SimulatePipelineAction extends ActionType<SimulatePipelineResponse> {
 
     public static final SimulatePipelineAction INSTANCE = new SimulatePipelineAction();
diff --git a/server/src/main/java/org/opensearch/action/ingest/SimulatePipelineRequest.java b/server/src/main/java/org/opensearch/action/ingest/SimulatePipelineRequest.java
index bc0317e076319..2766e3fb1a038 100644
--- a/server/src/main/java/org/opensearch/action/ingest/SimulatePipelineRequest.java
+++ b/server/src/main/java/org/opensearch/action/ingest/SimulatePipelineRequest.java
@@ -55,6 +55,11 @@
 import java.util.Map;
 import java.util.Objects;
 
+/**
+ * transport request to simulate a pipeline
+ *
+ * @opensearch.internal
+ */
 public class SimulatePipelineRequest extends ActionRequest implements ToXContentObject {
 
     private static final DeprecationLogger deprecationLogger = DeprecationLogger.getLogger(SimulatePipelineRequest.class);
diff --git a/server/src/main/java/org/opensearch/action/ingest/SimulatePipelineRequestBuilder.java b/server/src/main/java/org/opensearch/action/ingest/SimulatePipelineRequestBuilder.java
index 6befbea774685..0cf71b66fe936 100644
--- a/server/src/main/java/org/opensearch/action/ingest/SimulatePipelineRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/ingest/SimulatePipelineRequestBuilder.java
@@ -37,6 +37,11 @@
 import org.opensearch.common.bytes.BytesReference;
 import org.opensearch.common.xcontent.XContentType;
 
+/**
+ * Transport request builder to simulate a pipeline
+ *
+ * @opensearch.internal
+ */
 public class SimulatePipelineRequestBuilder extends ActionRequestBuilder<SimulatePipelineRequest, SimulatePipelineResponse> {
 
     /**
diff --git a/server/src/main/java/org/opensearch/action/ingest/SimulatePipelineResponse.java b/server/src/main/java/org/opensearch/action/ingest/SimulatePipelineResponse.java
index c3540e4e9b8fd..1b1b93ffde98b 100644
--- a/server/src/main/java/org/opensearch/action/ingest/SimulatePipelineResponse.java
+++ b/server/src/main/java/org/opensearch/action/ingest/SimulatePipelineResponse.java
@@ -51,6 +51,11 @@
 import static org.opensearch.common.xcontent.ConstructingObjectParser.constructorArg;
 import static org.opensearch.common.xcontent.XContentParserUtils.ensureExpectedToken;
 
+/**
+ * transport response for simulating a pipeline
+ *
+ * @opensearch.internal
+ */
 public class SimulatePipelineResponse extends ActionResponse implements ToXContentObject {
     private String pipelineId;
     private boolean verbose;
diff --git a/server/src/main/java/org/opensearch/action/ingest/SimulatePipelineTransportAction.java b/server/src/main/java/org/opensearch/action/ingest/SimulatePipelineTransportAction.java
index 7348035deaafe..daffbbf61a1bb 100644
--- a/server/src/main/java/org/opensearch/action/ingest/SimulatePipelineTransportAction.java
+++ b/server/src/main/java/org/opensearch/action/ingest/SimulatePipelineTransportAction.java
@@ -45,6 +45,11 @@
 
 import java.util.Map;
 
+/**
+ * Perform the action of simulating a pipeline
+ *
+ * @opensearch.internal
+ */
 public class SimulatePipelineTransportAction extends HandledTransportAction<SimulatePipelineRequest, SimulatePipelineResponse> {
 
     private final IngestService ingestService;
diff --git a/server/src/main/java/org/opensearch/action/ingest/SimulateProcessorResult.java b/server/src/main/java/org/opensearch/action/ingest/SimulateProcessorResult.java
index eae36cc4efd7c..e971aca855c30 100644
--- a/server/src/main/java/org/opensearch/action/ingest/SimulateProcessorResult.java
+++ b/server/src/main/java/org/opensearch/action/ingest/SimulateProcessorResult.java
@@ -51,6 +51,11 @@
 import static org.opensearch.common.xcontent.ConstructingObjectParser.constructorArg;
 import static org.opensearch.common.xcontent.ConstructingObjectParser.optionalConstructorArg;
 
+/**
+ * Simulates an ingest processor result
+ *
+ * @opensearch.internal
+ */
 public class SimulateProcessorResult implements Writeable, ToXContentObject {
 
     private static final String IGNORED_ERROR_FIELD = "ignored_error";
diff --git a/server/src/main/java/org/opensearch/action/ingest/WriteableIngestDocument.java b/server/src/main/java/org/opensearch/action/ingest/WriteableIngestDocument.java
index 2f8c65486c22f..9ceb1d7e3f890 100644
--- a/server/src/main/java/org/opensearch/action/ingest/WriteableIngestDocument.java
+++ b/server/src/main/java/org/opensearch/action/ingest/WriteableIngestDocument.java
@@ -52,6 +52,11 @@
 import static org.opensearch.common.xcontent.ConstructingObjectParser.constructorArg;
 import static org.opensearch.common.xcontent.ConstructingObjectParser.optionalConstructorArg;
 
+/**
+ * An ingest document that implements writeable
+ *
+ * @opensearch.internal
+ */
 final class WriteableIngestDocument implements Writeable, ToXContentFragment {
 
     static final String SOURCE_FIELD = "_source";
diff --git a/server/src/main/java/org/opensearch/action/main/MainAction.java b/server/src/main/java/org/opensearch/action/main/MainAction.java
index 46de6f9e2b0f0..c5cbac824ec83 100644
--- a/server/src/main/java/org/opensearch/action/main/MainAction.java
+++ b/server/src/main/java/org/opensearch/action/main/MainAction.java
@@ -34,6 +34,11 @@
 
 import org.opensearch.action.ActionType;
 
+/**
+ * The main OpenSearch Action
+ *
+ * @opensearch.internal
+ */
 public class MainAction extends ActionType<MainResponse> {
 
     public static final String NAME = "cluster:monitor/main";
diff --git a/server/src/main/java/org/opensearch/action/main/MainRequest.java b/server/src/main/java/org/opensearch/action/main/MainRequest.java
index f5cafecb87375..e1c1844f9d4dc 100644
--- a/server/src/main/java/org/opensearch/action/main/MainRequest.java
+++ b/server/src/main/java/org/opensearch/action/main/MainRequest.java
@@ -38,6 +38,11 @@
 
 import java.io.IOException;
 
+/**
+ * Transport request for main action
+ *
+ * @opensearch.internal
+ */
 public class MainRequest extends ActionRequest {
 
     public MainRequest() {}
diff --git a/server/src/main/java/org/opensearch/action/main/MainRequestBuilder.java b/server/src/main/java/org/opensearch/action/main/MainRequestBuilder.java
index 8f73f316194ba..bd62882551c44 100644
--- a/server/src/main/java/org/opensearch/action/main/MainRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/main/MainRequestBuilder.java
@@ -35,6 +35,11 @@
 import org.opensearch.action.ActionRequestBuilder;
 import org.opensearch.client.OpenSearchClient;
 
+/**
+ * Transport request builder for the main opensearch action
+ *
+ * @opensearch.internal
+ */
 public class MainRequestBuilder extends ActionRequestBuilder<MainRequest, MainResponse> {
 
     public MainRequestBuilder(OpenSearchClient client, MainAction action) {
diff --git a/server/src/main/java/org/opensearch/action/main/MainResponse.java b/server/src/main/java/org/opensearch/action/main/MainResponse.java
index 1f460e5dfb019..691bbda512275 100644
--- a/server/src/main/java/org/opensearch/action/main/MainResponse.java
+++ b/server/src/main/java/org/opensearch/action/main/MainResponse.java
@@ -48,6 +48,11 @@
 import java.io.IOException;
 import java.util.Objects;
 
+/**
+ * The main response of opensearch
+ *
+ * @opensearch.internal
+ */
 public class MainResponse extends ActionResponse implements ToXContentObject {
 
     private String nodeName;
diff --git a/server/src/main/java/org/opensearch/action/main/TransportMainAction.java b/server/src/main/java/org/opensearch/action/main/TransportMainAction.java
index 5170b23977b1e..2916c3dd88d49 100644
--- a/server/src/main/java/org/opensearch/action/main/TransportMainAction.java
+++ b/server/src/main/java/org/opensearch/action/main/TransportMainAction.java
@@ -45,6 +45,11 @@
 import org.opensearch.tasks.Task;
 import org.opensearch.transport.TransportService;
 
+/**
+ * Performs the main action
+ *
+ * @opensearch.internal
+ */
 public class TransportMainAction extends HandledTransportAction<MainRequest, MainResponse> {
 
     private final String nodeName;
diff --git a/server/src/main/java/org/opensearch/action/resync/ResyncReplicationRequest.java b/server/src/main/java/org/opensearch/action/resync/ResyncReplicationRequest.java
index 2ecbc49384fe5..d87b5b05118e3 100644
--- a/server/src/main/java/org/opensearch/action/resync/ResyncReplicationRequest.java
+++ b/server/src/main/java/org/opensearch/action/resync/ResyncReplicationRequest.java
@@ -43,6 +43,7 @@
 
 /**
  * Represents a batch of operations sent from the primary to its replicas during the primary-replica resync.
+ * @opensearch.internal
  */
 public final class ResyncReplicationRequest extends ReplicatedWriteRequest<ResyncReplicationRequest> {
 
diff --git a/server/src/main/java/org/opensearch/action/resync/ResyncReplicationResponse.java b/server/src/main/java/org/opensearch/action/resync/ResyncReplicationResponse.java
index 1e052c5d80e80..22507ee717a1c 100644
--- a/server/src/main/java/org/opensearch/action/resync/ResyncReplicationResponse.java
+++ b/server/src/main/java/org/opensearch/action/resync/ResyncReplicationResponse.java
@@ -37,6 +37,11 @@
 
 import java.io.IOException;
 
+/**
+ * Transport response for resyncing replication
+ *
+ * @opensearch.internal
+ */
 public final class ResyncReplicationResponse extends ReplicationResponse implements WriteResponse {
 
     public ResyncReplicationResponse() {}
diff --git a/server/src/main/java/org/opensearch/action/resync/TransportResyncReplicationAction.java b/server/src/main/java/org/opensearch/action/resync/TransportResyncReplicationAction.java
index ea596b12f262f..f022e325dceb0 100644
--- a/server/src/main/java/org/opensearch/action/resync/TransportResyncReplicationAction.java
+++ b/server/src/main/java/org/opensearch/action/resync/TransportResyncReplicationAction.java
@@ -64,6 +64,11 @@
 import java.util.function.Function;
 import java.util.stream.Stream;
 
+/**
+ * Perform replication resync
+ *
+ * @opensearch.internal
+ */
 public class TransportResyncReplicationAction extends TransportWriteAction<
     ResyncReplicationRequest,
     ResyncReplicationRequest,
diff --git a/server/src/main/java/org/opensearch/action/search/AbstractSearchAsyncAction.java b/server/src/main/java/org/opensearch/action/search/AbstractSearchAsyncAction.java
index 190904145b091..fd93d5f17fdef 100644
--- a/server/src/main/java/org/opensearch/action/search/AbstractSearchAsyncAction.java
+++ b/server/src/main/java/org/opensearch/action/search/AbstractSearchAsyncAction.java
@@ -78,6 +78,8 @@
  * referred to as the {@code shardIndex}.
  * The fan out and collect algorithm is traditionally used as the initial phase which can either be a query execution or collection of
  * distributed frequencies
+ *
+ * @opensearch.internal
  */
 abstract class AbstractSearchAsyncAction<Result extends SearchPhaseResult> extends SearchPhase implements SearchPhaseContext {
     private static final float DEFAULT_INDEX_BOOST = 1.0f;
diff --git a/server/src/main/java/org/opensearch/action/search/ArraySearchPhaseResults.java b/server/src/main/java/org/opensearch/action/search/ArraySearchPhaseResults.java
index 58cffe2ed5b8c..61c81e6cda97a 100644
--- a/server/src/main/java/org/opensearch/action/search/ArraySearchPhaseResults.java
+++ b/server/src/main/java/org/opensearch/action/search/ArraySearchPhaseResults.java
@@ -39,6 +39,8 @@
 
 /**
  * This class acts as a basic result collection that can be extended to do on-the-fly reduction or result processing
+ *
+ * @opensearch.internal
  */
 class ArraySearchPhaseResults<Result extends SearchPhaseResult> extends SearchPhaseResults<Result> {
     final AtomicArray<Result> results;
diff --git a/server/src/main/java/org/opensearch/action/search/BottomSortValuesCollector.java b/server/src/main/java/org/opensearch/action/search/BottomSortValuesCollector.java
index 64f50d2f37cdb..c831c80b6455c 100644
--- a/server/src/main/java/org/opensearch/action/search/BottomSortValuesCollector.java
+++ b/server/src/main/java/org/opensearch/action/search/BottomSortValuesCollector.java
@@ -41,6 +41,8 @@
 
 /**
  * Utility class to keep track of the bottom doc's sort values in a distributed search.
+ *
+ * @opensearch.internal
  */
 class BottomSortValuesCollector {
     private final int topNSize;
diff --git a/server/src/main/java/org/opensearch/action/search/CanMatchPreFilterSearchPhase.java b/server/src/main/java/org/opensearch/action/search/CanMatchPreFilterSearchPhase.java
index 2e67e6aa93a72..816ca45d13c10 100644
--- a/server/src/main/java/org/opensearch/action/search/CanMatchPreFilterSearchPhase.java
+++ b/server/src/main/java/org/opensearch/action/search/CanMatchPreFilterSearchPhase.java
@@ -67,6 +67,8 @@
  * When the query primary sort is perform on a field, this phase extracts the min/max value in each shard and
  * sort them according to the provided order. This can be useful for instance to ensure that shards that contain recent
  * data are executed first when sorting by descending timestamp.
+ *
+ * @opensearch.internal
  */
 final class CanMatchPreFilterSearchPhase extends AbstractSearchAsyncAction<CanMatchResponse> {
 
diff --git a/server/src/main/java/org/opensearch/action/search/ClearScrollAction.java b/server/src/main/java/org/opensearch/action/search/ClearScrollAction.java
index 91ae4b2109ae1..70072e5ec9156 100644
--- a/server/src/main/java/org/opensearch/action/search/ClearScrollAction.java
+++ b/server/src/main/java/org/opensearch/action/search/ClearScrollAction.java
@@ -34,6 +34,11 @@
 
 import org.opensearch.action.ActionType;
 
+/**
+ * Transport Action for clearing a scroll
+ *
+ * @opensearch.internal
+ */
 public class ClearScrollAction extends ActionType<ClearScrollResponse> {
 
     public static final ClearScrollAction INSTANCE = new ClearScrollAction();
diff --git a/server/src/main/java/org/opensearch/action/search/ClearScrollController.java b/server/src/main/java/org/opensearch/action/search/ClearScrollController.java
index 390f5e2b99e63..4bb3cbb88ba01 100644
--- a/server/src/main/java/org/opensearch/action/search/ClearScrollController.java
+++ b/server/src/main/java/org/opensearch/action/search/ClearScrollController.java
@@ -53,6 +53,11 @@
 import java.util.function.BiFunction;
 import java.util.stream.Collectors;
 
+/**
+ * Main controller for clearing a scroll
+ *
+ * @opensearch.internal
+ */
 public final class ClearScrollController implements Runnable {
     private final DiscoveryNodes nodes;
     private final SearchTransportService searchTransportService;
diff --git a/server/src/main/java/org/opensearch/action/search/ClearScrollRequest.java b/server/src/main/java/org/opensearch/action/search/ClearScrollRequest.java
index 3fb1ebcd6fcc2..4105f5ece5221 100644
--- a/server/src/main/java/org/opensearch/action/search/ClearScrollRequest.java
+++ b/server/src/main/java/org/opensearch/action/search/ClearScrollRequest.java
@@ -47,6 +47,11 @@
 
 import static org.opensearch.action.ValidateActions.addValidationError;
 
+/**
+ * Transport request for clearing a search scroll
+ *
+ * @opensearch.internal
+ */
 public class ClearScrollRequest extends ActionRequest implements ToXContentObject {
 
     private List<String> scrollIds;
diff --git a/server/src/main/java/org/opensearch/action/search/ClearScrollRequestBuilder.java b/server/src/main/java/org/opensearch/action/search/ClearScrollRequestBuilder.java
index ba76b641c8f56..63f64e02a9dd2 100644
--- a/server/src/main/java/org/opensearch/action/search/ClearScrollRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/search/ClearScrollRequestBuilder.java
@@ -37,6 +37,11 @@
 
 import java.util.List;
 
+/**
+ * Transport request builder for clearing a search scroll
+ *
+ * @opensearch.internal
+ */
 public class ClearScrollRequestBuilder extends ActionRequestBuilder<ClearScrollRequest, ClearScrollResponse> {
 
     public ClearScrollRequestBuilder(OpenSearchClient client, ClearScrollAction action) {
diff --git a/server/src/main/java/org/opensearch/action/search/ClearScrollResponse.java b/server/src/main/java/org/opensearch/action/search/ClearScrollResponse.java
index 7a989e646e4d0..e836860fd1990 100644
--- a/server/src/main/java/org/opensearch/action/search/ClearScrollResponse.java
+++ b/server/src/main/java/org/opensearch/action/search/ClearScrollResponse.java
@@ -49,6 +49,11 @@
 import static org.opensearch.rest.RestStatus.NOT_FOUND;
 import static org.opensearch.rest.RestStatus.OK;
 
+/**
+ * Transport response for clearing a search scroll
+ *
+ * @opensearch.internal
+ */
 public class ClearScrollResponse extends ActionResponse implements StatusToXContentObject {
 
     private static final ParseField SUCCEEDED = new ParseField("succeeded");
diff --git a/server/src/main/java/org/opensearch/action/search/CountedCollector.java b/server/src/main/java/org/opensearch/action/search/CountedCollector.java
index cb00902b52b7c..c73c4be2fa662 100644
--- a/server/src/main/java/org/opensearch/action/search/CountedCollector.java
+++ b/server/src/main/java/org/opensearch/action/search/CountedCollector.java
@@ -40,6 +40,8 @@
  * This is a simple base class to simplify fan out to shards and collect their results. Each results passed to
  * {@link #onResult(SearchPhaseResult)} will be set to the provided result array
  * where the given index is used to set the result on the array.
+ *
+ * @opensearch.internal
  */
 final class CountedCollector<R extends SearchPhaseResult> {
     private final ArraySearchPhaseResults<R> resultConsumer;
diff --git a/server/src/main/java/org/opensearch/action/search/DfsQueryPhase.java b/server/src/main/java/org/opensearch/action/search/DfsQueryPhase.java
index 6152f4cfdc599..c5747842614c7 100644
--- a/server/src/main/java/org/opensearch/action/search/DfsQueryPhase.java
+++ b/server/src/main/java/org/opensearch/action/search/DfsQueryPhase.java
@@ -50,6 +50,8 @@
  * retry on another shard if any of the shards are failing. Failures are treated as shard failures and are counted as a non-successful
  * operation.
  * @see CountedCollector#onFailure(int, SearchShardTarget, Exception)
+ *
+ * @opensearch.internal
  */
 final class DfsQueryPhase extends SearchPhase {
     private final ArraySearchPhaseResults<SearchPhaseResult> queryResult;
diff --git a/server/src/main/java/org/opensearch/action/search/ExpandSearchPhase.java b/server/src/main/java/org/opensearch/action/search/ExpandSearchPhase.java
index 6c131697cb31e..cdefe7c2c1712 100644
--- a/server/src/main/java/org/opensearch/action/search/ExpandSearchPhase.java
+++ b/server/src/main/java/org/opensearch/action/search/ExpandSearchPhase.java
@@ -53,6 +53,8 @@
  * This search phase is an optional phase that will be executed once all hits are fetched from the shards that executes
  * field-collapsing on the inner hits. This phase only executes if field collapsing is requested in the search request and otherwise
  * forwards to the next phase immediately.
+ *
+ * @opensearch.internal
  */
 final class ExpandSearchPhase extends SearchPhase {
     private final SearchPhaseContext context;
diff --git a/server/src/main/java/org/opensearch/action/search/FetchSearchPhase.java b/server/src/main/java/org/opensearch/action/search/FetchSearchPhase.java
index c106c5e2f8069..31ec896856ce6 100644
--- a/server/src/main/java/org/opensearch/action/search/FetchSearchPhase.java
+++ b/server/src/main/java/org/opensearch/action/search/FetchSearchPhase.java
@@ -56,6 +56,8 @@
 /**
  * This search phase merges the query results from the previous phase together and calculates the topN hits for this search.
  * Then it reaches out to all relevant shards to fetch the topN hits.
+ *
+ * @opensearch.internal
  */
 final class FetchSearchPhase extends SearchPhase {
     private final ArraySearchPhaseResults<FetchSearchResult> fetchResults;
diff --git a/server/src/main/java/org/opensearch/action/search/MaxScoreCollector.java b/server/src/main/java/org/opensearch/action/search/MaxScoreCollector.java
index fce1de8cecbda..d7e0ba6d30fec 100644
--- a/server/src/main/java/org/opensearch/action/search/MaxScoreCollector.java
+++ b/server/src/main/java/org/opensearch/action/search/MaxScoreCollector.java
@@ -40,6 +40,8 @@
 
 /**
  * A collector that computes the maximum score.
+ *
+ * @opensearch.internal
  */
 public class MaxScoreCollector extends SimpleCollector {
 
diff --git a/server/src/main/java/org/opensearch/action/search/MultiSearchAction.java b/server/src/main/java/org/opensearch/action/search/MultiSearchAction.java
index fc8416536bf0a..84c18855324a9 100644
--- a/server/src/main/java/org/opensearch/action/search/MultiSearchAction.java
+++ b/server/src/main/java/org/opensearch/action/search/MultiSearchAction.java
@@ -34,6 +34,11 @@
 
 import org.opensearch.action.ActionType;
 
+/**
+ * Transport action for executing a multi search
+ *
+ * @opensearch.internal
+ */
 public class MultiSearchAction extends ActionType<MultiSearchResponse> {
 
     public static final MultiSearchAction INSTANCE = new MultiSearchAction();
diff --git a/server/src/main/java/org/opensearch/action/search/MultiSearchRequest.java b/server/src/main/java/org/opensearch/action/search/MultiSearchRequest.java
index c45b6477d30f0..810c5f4a11258 100644
--- a/server/src/main/java/org/opensearch/action/search/MultiSearchRequest.java
+++ b/server/src/main/java/org/opensearch/action/search/MultiSearchRequest.java
@@ -70,6 +70,8 @@
 
 /**
  * A multi search API request.
+ *
+ * @opensearch.internal
  */
 public class MultiSearchRequest extends ActionRequest implements CompositeIndicesRequest {
 
diff --git a/server/src/main/java/org/opensearch/action/search/MultiSearchRequestBuilder.java b/server/src/main/java/org/opensearch/action/search/MultiSearchRequestBuilder.java
index e8db52b949425..f9bb90c69d925 100644
--- a/server/src/main/java/org/opensearch/action/search/MultiSearchRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/search/MultiSearchRequestBuilder.java
@@ -38,6 +38,8 @@
 
 /**
  * A request builder for multiple search requests.
+ *
+ * @opensearch.internal
  */
 public class MultiSearchRequestBuilder extends ActionRequestBuilder<MultiSearchRequest, MultiSearchResponse> {
 
diff --git a/server/src/main/java/org/opensearch/action/search/MultiSearchResponse.java b/server/src/main/java/org/opensearch/action/search/MultiSearchResponse.java
index 3869d909cce6e..2349b3a0cab9a 100644
--- a/server/src/main/java/org/opensearch/action/search/MultiSearchResponse.java
+++ b/server/src/main/java/org/opensearch/action/search/MultiSearchResponse.java
@@ -58,6 +58,8 @@
 
 /**
  * A multi search response.
+ *
+ * @opensearch.internal
  */
 public class MultiSearchResponse extends ActionResponse implements Iterable<MultiSearchResponse.Item>, ToXContentObject {
 
diff --git a/server/src/main/java/org/opensearch/action/search/ParsedScrollId.java b/server/src/main/java/org/opensearch/action/search/ParsedScrollId.java
index 1a9eaf7e6716f..70be9a0b19e08 100644
--- a/server/src/main/java/org/opensearch/action/search/ParsedScrollId.java
+++ b/server/src/main/java/org/opensearch/action/search/ParsedScrollId.java
@@ -34,6 +34,11 @@
 
 import java.util.Arrays;
 
+/**
+ * Search scroll id that has been parsed
+ *
+ * @opensearch.internal
+ */
 public class ParsedScrollId {
 
     public static final String QUERY_THEN_FETCH_TYPE = "queryThenFetch";
diff --git a/server/src/main/java/org/opensearch/action/search/QueryPhaseResultConsumer.java b/server/src/main/java/org/opensearch/action/search/QueryPhaseResultConsumer.java
index 02e6b54777f7f..c94a63ca2270c 100644
--- a/server/src/main/java/org/opensearch/action/search/QueryPhaseResultConsumer.java
+++ b/server/src/main/java/org/opensearch/action/search/QueryPhaseResultConsumer.java
@@ -66,6 +66,8 @@
  * in the {@link CircuitBreaker#REQUEST} circuit breaker. Before any partial or final reduce, the memory
  * needed to reduce the aggregations is estimated and a {@link CircuitBreakingException} is thrown if it
  * exceeds the maximum memory allowed in this breaker.
+ *
+ * @opensearch.internal
  */
 public class QueryPhaseResultConsumer extends ArraySearchPhaseResults<SearchPhaseResult> implements Releasable {
     private static final Logger logger = LogManager.getLogger(QueryPhaseResultConsumer.class);
diff --git a/server/src/main/java/org/opensearch/action/search/ReduceSearchPhaseException.java b/server/src/main/java/org/opensearch/action/search/ReduceSearchPhaseException.java
index 88558ceb6f7d9..57c1da5b25795 100644
--- a/server/src/main/java/org/opensearch/action/search/ReduceSearchPhaseException.java
+++ b/server/src/main/java/org/opensearch/action/search/ReduceSearchPhaseException.java
@@ -40,7 +40,7 @@
  * A failure during a reduce phase (when receiving results from several shards, and reducing them
  * into one or more results and possible actions).
  *
- *
+ * @opensearch.internal
  */
 public class ReduceSearchPhaseException extends SearchPhaseExecutionException {
 
diff --git a/server/src/main/java/org/opensearch/action/search/SearchAction.java b/server/src/main/java/org/opensearch/action/search/SearchAction.java
index e3a906f8b30ce..c94b3b7352196 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchAction.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchAction.java
@@ -34,6 +34,11 @@
 
 import org.opensearch.action.ActionType;
 
+/**
+ * Transport action for executing a search
+ *
+ * @opensearch.internal
+ */
 public class SearchAction extends ActionType<SearchResponse> {
 
     public static final SearchAction INSTANCE = new SearchAction();
diff --git a/server/src/main/java/org/opensearch/action/search/SearchActionListener.java b/server/src/main/java/org/opensearch/action/search/SearchActionListener.java
index c081dba3fe9c5..6983eed18b7b3 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchActionListener.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchActionListener.java
@@ -38,6 +38,8 @@
 /**
  * A base action listener that ensures shard target and shard index is set on all responses
  * received by this listener.
+ *
+ * @opensearch.internal
  */
 abstract class SearchActionListener<T extends SearchPhaseResult> implements ActionListener<T> {
 
diff --git a/server/src/main/java/org/opensearch/action/search/SearchContextId.java b/server/src/main/java/org/opensearch/action/search/SearchContextId.java
index 59ebb128b924a..c2bb46a7b0e57 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchContextId.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchContextId.java
@@ -57,6 +57,11 @@
 import java.util.Map;
 import java.util.Set;
 
+/**
+ * Id for a serach context.
+ *
+ * @opensearch.internal
+ */
 public class SearchContextId {
     private final Map<ShardId, SearchContextIdForNode> shards;
     private final Map<String, AliasFilter> aliasFilter;
diff --git a/server/src/main/java/org/opensearch/action/search/SearchContextIdForNode.java b/server/src/main/java/org/opensearch/action/search/SearchContextIdForNode.java
index 379b268042e52..8f16a6e3ee226 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchContextIdForNode.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchContextIdForNode.java
@@ -40,6 +40,11 @@
 
 import java.io.IOException;
 
+/**
+ * Id for a search context per node.
+ *
+ * @opensearch.internal
+ */
 public final class SearchContextIdForNode implements Writeable {
     private final String node;
     private final ShardSearchContextId searchContextId;
diff --git a/server/src/main/java/org/opensearch/action/search/SearchDfsQueryThenFetchAsyncAction.java b/server/src/main/java/org/opensearch/action/search/SearchDfsQueryThenFetchAsyncAction.java
index 50aac3daed52d..71a986c0e15f7 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchDfsQueryThenFetchAsyncAction.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchDfsQueryThenFetchAsyncAction.java
@@ -49,6 +49,11 @@
 import java.util.concurrent.Executor;
 import java.util.function.BiFunction;
 
+/**
+ * Async action for DFS Query Then Fetch
+ *
+ * @opensearch.internal
+ */
 final class SearchDfsQueryThenFetchAsyncAction extends AbstractSearchAsyncAction<DfsSearchResult> {
 
     private final SearchPhaseController searchPhaseController;
diff --git a/server/src/main/java/org/opensearch/action/search/SearchExecutionStatsCollector.java b/server/src/main/java/org/opensearch/action/search/SearchExecutionStatsCollector.java
index ce77a6368f2b6..7082e33dfd5c5 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchExecutionStatsCollector.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchExecutionStatsCollector.java
@@ -46,6 +46,8 @@
  * A wrapper of search action listeners (search results) that unwraps the query
  * result to get the piggybacked queue size and service time EWMA, adding those
  * values to the coordinating nodes' {@link ResponseCollectorService}.
+ *
+ * @opensearch.internal
  */
 public final class SearchExecutionStatsCollector implements ActionListener<SearchPhaseResult> {
 
diff --git a/server/src/main/java/org/opensearch/action/search/SearchPhase.java b/server/src/main/java/org/opensearch/action/search/SearchPhase.java
index 18509a2694cd1..50f0940754078 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchPhase.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchPhase.java
@@ -38,6 +38,8 @@
 
 /**
  * Base class for all individual search phases like collecting distributed frequencies, fetching documents, querying shards.
+ *
+ * @opensearch.internal
  */
 abstract class SearchPhase implements CheckedRunnable<IOException> {
     private final String name;
diff --git a/server/src/main/java/org/opensearch/action/search/SearchPhaseContext.java b/server/src/main/java/org/opensearch/action/search/SearchPhaseContext.java
index 2f30d28a0924c..be364fbcb9c84 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchPhaseContext.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchPhaseContext.java
@@ -47,6 +47,8 @@
 
 /**
  * This class provide contextual state and access to resources across multiple search phases.
+ *
+ * @opensearch.internal
  */
 interface SearchPhaseContext extends Executor {
     // TODO maybe we can make this concrete later - for now we just implement this in the base class for all initial phases
diff --git a/server/src/main/java/org/opensearch/action/search/SearchPhaseController.java b/server/src/main/java/org/opensearch/action/search/SearchPhaseController.java
index 8c3b1d20b33a0..4fb940675a5aa 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchPhaseController.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchPhaseController.java
@@ -84,6 +84,11 @@
 import java.util.function.IntFunction;
 import java.util.stream.Collectors;
 
+/**
+ * Controller for the search phase.
+ *
+ * @opensearch.internal
+ */
 public final class SearchPhaseController {
     private static final ScoreDoc[] EMPTY_DOCS = new ScoreDoc[0];
 
diff --git a/server/src/main/java/org/opensearch/action/search/SearchPhaseExecutionException.java b/server/src/main/java/org/opensearch/action/search/SearchPhaseExecutionException.java
index fbe6ef667f4f7..cb24118408abf 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchPhaseExecutionException.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchPhaseExecutionException.java
@@ -46,6 +46,11 @@
 import java.util.Arrays;
 import java.util.List;
 
+/**
+ * Main exception thrown when there is an error in the search phase
+ *
+ * @opensearch.internal
+ */
 public class SearchPhaseExecutionException extends OpenSearchException {
     private final String phaseName;
     private final ShardSearchFailure[] shardFailures;
diff --git a/server/src/main/java/org/opensearch/action/search/SearchPhaseResults.java b/server/src/main/java/org/opensearch/action/search/SearchPhaseResults.java
index 3fa520f1fb5d6..1baea0e721c44 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchPhaseResults.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchPhaseResults.java
@@ -39,6 +39,8 @@
 
 /**
  * This class acts as a basic result collection that can be extended to do on-the-fly reduction or result processing
+ *
+ * @opensearch.internal
  */
 abstract class SearchPhaseResults<Result extends SearchPhaseResult> {
     private final int numShards;
diff --git a/server/src/main/java/org/opensearch/action/search/SearchProgressActionListener.java b/server/src/main/java/org/opensearch/action/search/SearchProgressActionListener.java
index 088aac6d71d30..3f24eea0bfe1e 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchProgressActionListener.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchProgressActionListener.java
@@ -37,5 +37,7 @@
 /**
  * An {@link ActionListener} for search requests that allows to track progress of the {@link SearchAction}.
  * See {@link SearchProgressListener}.
+ *
+ * @opensearch.internal
  */
 public abstract class SearchProgressActionListener extends SearchProgressListener implements ActionListener<SearchResponse> {}
diff --git a/server/src/main/java/org/opensearch/action/search/SearchProgressListener.java b/server/src/main/java/org/opensearch/action/search/SearchProgressListener.java
index 78b1dd19dadaa..ffc64682cb07d 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchProgressListener.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchProgressListener.java
@@ -50,6 +50,8 @@
 
 /**
  * A listener that allows to track progress of the {@link SearchAction}.
+ *
+ * @opensearch.api
  */
 public abstract class SearchProgressListener {
     private static final Logger logger = LogManager.getLogger(SearchProgressListener.class);
diff --git a/server/src/main/java/org/opensearch/action/search/SearchQueryThenFetchAsyncAction.java b/server/src/main/java/org/opensearch/action/search/SearchQueryThenFetchAsyncAction.java
index 93ce3cfd8c715..1ead14aac6b51 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchQueryThenFetchAsyncAction.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchQueryThenFetchAsyncAction.java
@@ -50,6 +50,11 @@
 import java.util.concurrent.Executor;
 import java.util.function.BiFunction;
 
+/**
+ * Async transport action for query then fetch
+ *
+ * @opensearch.internal
+ */
 class SearchQueryThenFetchAsyncAction extends AbstractSearchAsyncAction<SearchPhaseResult> {
 
     private final SearchPhaseController searchPhaseController;
diff --git a/server/src/main/java/org/opensearch/action/search/SearchRequest.java b/server/src/main/java/org/opensearch/action/search/SearchRequest.java
index c4b97c35bc405..da34dab6383d9 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchRequest.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchRequest.java
@@ -69,6 +69,8 @@
  * @see org.opensearch.client.Requests#searchRequest(String...)
  * @see org.opensearch.client.Client#search(SearchRequest)
  * @see SearchResponse
+ *
+ * @opensearch.internal
  */
 public class SearchRequest extends ActionRequest implements IndicesRequest.Replaceable {
 
diff --git a/server/src/main/java/org/opensearch/action/search/SearchRequestBuilder.java b/server/src/main/java/org/opensearch/action/search/SearchRequestBuilder.java
index 6def33f82b7bd..8e3d9d3968fc6 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchRequestBuilder.java
@@ -57,6 +57,8 @@
 
 /**
  * A search action request builder.
+ *
+ * @opensearch.internal
  */
 public class SearchRequestBuilder extends ActionRequestBuilder<SearchRequest, SearchResponse> {
 
diff --git a/server/src/main/java/org/opensearch/action/search/SearchResponse.java b/server/src/main/java/org/opensearch/action/search/SearchResponse.java
index e1175dc079ee0..a99de14d2a9e3 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchResponse.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchResponse.java
@@ -69,6 +69,8 @@
 
 /**
  * A response of a search request.
+ *
+ * @opensearch.internal
  */
 public class SearchResponse extends ActionResponse implements StatusToXContentObject {
 
diff --git a/server/src/main/java/org/opensearch/action/search/SearchResponseMerger.java b/server/src/main/java/org/opensearch/action/search/SearchResponseMerger.java
index 528c0693fbcd8..9c32da2d122e0 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchResponseMerger.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchResponseMerger.java
@@ -79,6 +79,8 @@
  * - scroll requests are not supported
  * - field collapsing is supported, but whenever inner_hits are requested, they will be retrieved by each cluster locally after the fetch
  * phase, through the {@link ExpandSearchPhase}. Such inner_hits are not merged together as part of hits reduction.
+ *
+ * @opensearch.internal
  */
 // TODO it may make sense to integrate the remote clusters responses as a shard response in the initial search phase and ignore hits coming
 // from the remote clusters in the fetch phase. This would be identical to the removed QueryAndFetch strategy except that only the remote
diff --git a/server/src/main/java/org/opensearch/action/search/SearchResponseSections.java b/server/src/main/java/org/opensearch/action/search/SearchResponseSections.java
index e146859bb295f..5fc584f76eb46 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchResponseSections.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchResponseSections.java
@@ -52,6 +52,8 @@
  * The reason why this class exists is that the high level REST client uses its own classes
  * to parse aggregations into, which are not serializable. This is the common part that can be
  * shared between core and client.
+ *
+ * @opensearch.internal
  */
 public class SearchResponseSections implements ToXContentFragment {
 
diff --git a/server/src/main/java/org/opensearch/action/search/SearchScrollAction.java b/server/src/main/java/org/opensearch/action/search/SearchScrollAction.java
index 4aec3d39e6f47..1f466d35f0ac2 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchScrollAction.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchScrollAction.java
@@ -34,6 +34,11 @@
 
 import org.opensearch.action.ActionType;
 
+/**
+ * Transport action for a search scroll
+ *
+ * @opensearch.internal
+ */
 public class SearchScrollAction extends ActionType<SearchResponse> {
 
     public static final SearchScrollAction INSTANCE = new SearchScrollAction();
diff --git a/server/src/main/java/org/opensearch/action/search/SearchScrollAsyncAction.java b/server/src/main/java/org/opensearch/action/search/SearchScrollAsyncAction.java
index f98a75d37988c..ffa944ae62763 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchScrollAsyncAction.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchScrollAsyncAction.java
@@ -62,6 +62,8 @@
  * Abstract base class for scroll execution modes. This class encapsulates the basic logic to
  * fan out to nodes and execute the query part of the scroll request. Subclasses can for instance
  * run separate fetch phases etc.
+ *
+ * @opensearch.internal
  */
 abstract class SearchScrollAsyncAction<T extends SearchPhaseResult> implements Runnable {
     protected final Logger logger;
diff --git a/server/src/main/java/org/opensearch/action/search/SearchScrollQueryAndFetchAsyncAction.java b/server/src/main/java/org/opensearch/action/search/SearchScrollQueryAndFetchAsyncAction.java
index 59ce2567bdf18..c1b4f56f7adc3 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchScrollQueryAndFetchAsyncAction.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchScrollQueryAndFetchAsyncAction.java
@@ -44,6 +44,11 @@
 
 import java.util.function.BiFunction;
 
+/**
+ * Async action for a search scroll query then fetch
+ *
+ * @opensearch.internal
+ */
 final class SearchScrollQueryAndFetchAsyncAction extends SearchScrollAsyncAction<ScrollQueryFetchSearchResult> {
 
     private final SearchTask task;
diff --git a/server/src/main/java/org/opensearch/action/search/SearchScrollQueryThenFetchAsyncAction.java b/server/src/main/java/org/opensearch/action/search/SearchScrollQueryThenFetchAsyncAction.java
index effe5afd0cad6..4119cb1cf28a0 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchScrollQueryThenFetchAsyncAction.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchScrollQueryThenFetchAsyncAction.java
@@ -50,6 +50,11 @@
 
 import java.util.function.BiFunction;
 
+/**
+ * async action for a search scroll query then fetch
+ *
+ * @opensearch.internal
+ */
 final class SearchScrollQueryThenFetchAsyncAction extends SearchScrollAsyncAction<ScrollQuerySearchResult> {
 
     private final SearchTask task;
diff --git a/server/src/main/java/org/opensearch/action/search/SearchScrollRequest.java b/server/src/main/java/org/opensearch/action/search/SearchScrollRequest.java
index 828228e869831..8b53d1f3096fb 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchScrollRequest.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchScrollRequest.java
@@ -50,6 +50,11 @@
 
 import static org.opensearch.action.ValidateActions.addValidationError;
 
+/**
+ * Transport request for a search scroll
+ *
+ * @opensearch.internal
+ */
 public class SearchScrollRequest extends ActionRequest implements ToXContentObject {
 
     private String scrollId;
diff --git a/server/src/main/java/org/opensearch/action/search/SearchScrollRequestBuilder.java b/server/src/main/java/org/opensearch/action/search/SearchScrollRequestBuilder.java
index 79bd952333de2..638c595216631 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchScrollRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchScrollRequestBuilder.java
@@ -39,6 +39,8 @@
 
 /**
  * A search scroll action request builder.
+ *
+ * @opensearch.internal
  */
 public class SearchScrollRequestBuilder extends ActionRequestBuilder<SearchScrollRequest, SearchResponse> {
 
diff --git a/server/src/main/java/org/opensearch/action/search/SearchShard.java b/server/src/main/java/org/opensearch/action/search/SearchShard.java
index 110209e3e9af0..cdfc4e816b455 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchShard.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchShard.java
@@ -41,6 +41,8 @@
 /**
  * A class that encapsulates the {@link ShardId} and the cluster alias
  * of a shard used during the search action.
+ *
+ * @opensearch.internal
  */
 public final class SearchShard implements Comparable<SearchShard> {
     @Nullable
diff --git a/server/src/main/java/org/opensearch/action/search/SearchShardIterator.java b/server/src/main/java/org/opensearch/action/search/SearchShardIterator.java
index 1ae0d8f78aa9c..72951f60c286e 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchShardIterator.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchShardIterator.java
@@ -53,6 +53,8 @@
  * of the search request (useful especially with cross-cluster search, as each cluster has its own set of original indices) as well as
  * the cluster alias.
  * @see OriginalIndices
+ *
+ * @opensearch.internal
  */
 public final class SearchShardIterator implements Comparable<SearchShardIterator>, Countable {
 
diff --git a/server/src/main/java/org/opensearch/action/search/SearchShardTask.java b/server/src/main/java/org/opensearch/action/search/SearchShardTask.java
index 2e506c6fe181b..e5f25595b9ec8 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchShardTask.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchShardTask.java
@@ -42,6 +42,8 @@
 /**
  * Task storing information about a currently running search shard request.
  * See {@link ShardSearchRequest}, {@link ShardFetchSearchRequest}, ...
+ *
+ * @opensearch.internal
  */
 public class SearchShardTask extends CancellableTask {
 
diff --git a/server/src/main/java/org/opensearch/action/search/SearchTask.java b/server/src/main/java/org/opensearch/action/search/SearchTask.java
index 7f80f7836be6c..89f23bb9bdaeb 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchTask.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchTask.java
@@ -43,6 +43,8 @@
 
 /**
  * Task storing information about a currently running {@link SearchRequest}.
+ *
+ * @opensearch.internal
  */
 public class SearchTask extends CancellableTask {
     // generating description in a lazy way since source can be quite big
diff --git a/server/src/main/java/org/opensearch/action/search/SearchTransportService.java b/server/src/main/java/org/opensearch/action/search/SearchTransportService.java
index 121de6d1c80da..4a901ebef10ce 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchTransportService.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchTransportService.java
@@ -79,6 +79,8 @@
 /**
  * An encapsulation of {@link org.opensearch.search.SearchService} operations exposed through
  * transport.
+ *
+ * @opensearch.internal
  */
 public class SearchTransportService {
 
diff --git a/server/src/main/java/org/opensearch/action/search/SearchType.java b/server/src/main/java/org/opensearch/action/search/SearchType.java
index ea50ea4b93491..cb86c0d6c1b4a 100644
--- a/server/src/main/java/org/opensearch/action/search/SearchType.java
+++ b/server/src/main/java/org/opensearch/action/search/SearchType.java
@@ -35,7 +35,7 @@
 /**
  * Search type represent the manner at which the search operation is executed.
  *
- *
+ * @opensearch.internal
  */
 public enum SearchType {
     /**
diff --git a/server/src/main/java/org/opensearch/action/search/ShardSearchFailure.java b/server/src/main/java/org/opensearch/action/search/ShardSearchFailure.java
index 228eac89f48d5..03bca93d5f001 100644
--- a/server/src/main/java/org/opensearch/action/search/ShardSearchFailure.java
+++ b/server/src/main/java/org/opensearch/action/search/ShardSearchFailure.java
@@ -55,6 +55,8 @@
 
 /**
  * Represents a failure to search on a specific shard.
+ *
+ * @opensearch.internal
  */
 public class ShardSearchFailure extends ShardOperationFailedException {
 
diff --git a/server/src/main/java/org/opensearch/action/search/TransportClearScrollAction.java b/server/src/main/java/org/opensearch/action/search/TransportClearScrollAction.java
index 1158dbe2b06e8..c9b6e967d153c 100644
--- a/server/src/main/java/org/opensearch/action/search/TransportClearScrollAction.java
+++ b/server/src/main/java/org/opensearch/action/search/TransportClearScrollAction.java
@@ -41,6 +41,11 @@
 import org.opensearch.tasks.Task;
 import org.opensearch.transport.TransportService;
 
+/**
+ * Perform transport action to clear a search scroll
+ *
+ * @opensearch.internal
+ */
 public class TransportClearScrollAction extends HandledTransportAction<ClearScrollRequest, ClearScrollResponse> {
 
     private final ClusterService clusterService;
diff --git a/server/src/main/java/org/opensearch/action/search/TransportMultiSearchAction.java b/server/src/main/java/org/opensearch/action/search/TransportMultiSearchAction.java
index 6c54136254832..683b4b3eb2d19 100644
--- a/server/src/main/java/org/opensearch/action/search/TransportMultiSearchAction.java
+++ b/server/src/main/java/org/opensearch/action/search/TransportMultiSearchAction.java
@@ -54,6 +54,11 @@
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.function.LongSupplier;
 
+/**
+ * Perform action for a multi search
+ *
+ * @opensearch.internal
+ */
 public class TransportMultiSearchAction extends HandledTransportAction<MultiSearchRequest, MultiSearchResponse> {
 
     private final int allocatedProcessors;
diff --git a/server/src/main/java/org/opensearch/action/search/TransportSearchAction.java b/server/src/main/java/org/opensearch/action/search/TransportSearchAction.java
index 73eb7b0a98fef..6af56abba99cb 100644
--- a/server/src/main/java/org/opensearch/action/search/TransportSearchAction.java
+++ b/server/src/main/java/org/opensearch/action/search/TransportSearchAction.java
@@ -117,6 +117,11 @@
 import static org.opensearch.action.search.SearchType.QUERY_THEN_FETCH;
 import static org.opensearch.search.sort.FieldSortBuilder.hasPrimaryFieldSort;
 
+/**
+ * Perform search action
+ *
+ * @opensearch.internal
+ */
 public class TransportSearchAction extends HandledTransportAction<SearchRequest, SearchResponse> {
 
     /** The maximum number of shards for a single search request. */
diff --git a/server/src/main/java/org/opensearch/action/search/TransportSearchHelper.java b/server/src/main/java/org/opensearch/action/search/TransportSearchHelper.java
index 7ddfdfec34cb1..3e5c76aa1f66f 100644
--- a/server/src/main/java/org/opensearch/action/search/TransportSearchHelper.java
+++ b/server/src/main/java/org/opensearch/action/search/TransportSearchHelper.java
@@ -48,6 +48,11 @@
 import java.io.UncheckedIOException;
 import java.util.Base64;
 
+/**
+ * Helper class for the search transport
+ *
+ * @opensearch.internal
+ */
 final class TransportSearchHelper {
 
     private static final String INCLUDE_CONTEXT_UUID = "include_context_uuid";
diff --git a/server/src/main/java/org/opensearch/action/search/TransportSearchScrollAction.java b/server/src/main/java/org/opensearch/action/search/TransportSearchScrollAction.java
index cb7c0b4a1873b..b67270ec9c9a5 100644
--- a/server/src/main/java/org/opensearch/action/search/TransportSearchScrollAction.java
+++ b/server/src/main/java/org/opensearch/action/search/TransportSearchScrollAction.java
@@ -41,6 +41,11 @@
 import org.opensearch.tasks.Task;
 import org.opensearch.transport.TransportService;
 
+/**
+ * Perform the search scroll
+ *
+ * @opensearch.internal
+ */
 public class TransportSearchScrollAction extends HandledTransportAction<SearchScrollRequest, SearchResponse> {
 
     private final ClusterService clusterService;
diff --git a/server/src/main/java/org/opensearch/action/support/ActionFilter.java b/server/src/main/java/org/opensearch/action/support/ActionFilter.java
index 414ef2a329214..2fe32b120d4a9 100644
--- a/server/src/main/java/org/opensearch/action/support/ActionFilter.java
+++ b/server/src/main/java/org/opensearch/action/support/ActionFilter.java
@@ -39,6 +39,8 @@
 
 /**
  * A filter allowing to filter transport actions
+ *
+ * @opensearch.internal
  */
 public interface ActionFilter {
 
diff --git a/server/src/main/java/org/opensearch/action/support/ActionFilterChain.java b/server/src/main/java/org/opensearch/action/support/ActionFilterChain.java
index 65821f14167f7..1eb5682343ffa 100644
--- a/server/src/main/java/org/opensearch/action/support/ActionFilterChain.java
+++ b/server/src/main/java/org/opensearch/action/support/ActionFilterChain.java
@@ -39,6 +39,8 @@
 
 /**
  * A filter chain allowing to continue and process the transport action request
+ *
+ * @opensearch.internal
  */
 public interface ActionFilterChain<Request extends ActionRequest, Response extends ActionResponse> {
 
diff --git a/server/src/main/java/org/opensearch/action/support/ActionFilters.java b/server/src/main/java/org/opensearch/action/support/ActionFilters.java
index 452b7e7f5238f..95cafbea4d7c1 100644
--- a/server/src/main/java/org/opensearch/action/support/ActionFilters.java
+++ b/server/src/main/java/org/opensearch/action/support/ActionFilters.java
@@ -38,6 +38,8 @@
 
 /**
  * Holds the action filters injected through plugins, properly sorted by {@link org.opensearch.action.support.ActionFilter#order()}
+ *
+ * @opensearch.internal
  */
 public class ActionFilters {
 
diff --git a/server/src/main/java/org/opensearch/action/support/ActiveShardCount.java b/server/src/main/java/org/opensearch/action/support/ActiveShardCount.java
index 9edd9bba0ef6e..10699690d0aff 100644
--- a/server/src/main/java/org/opensearch/action/support/ActiveShardCount.java
+++ b/server/src/main/java/org/opensearch/action/support/ActiveShardCount.java
@@ -49,6 +49,8 @@
 /**
  * A class whose instances represent a value for counting the number
  * of active shard copies for a given shard in an index.
+ *
+ * @opensearch.internal
  */
 public final class ActiveShardCount implements Writeable {
 
diff --git a/server/src/main/java/org/opensearch/action/support/ActiveShardsObserver.java b/server/src/main/java/org/opensearch/action/support/ActiveShardsObserver.java
index 064ae2ee522f9..7a4ae0e31cf55 100644
--- a/server/src/main/java/org/opensearch/action/support/ActiveShardsObserver.java
+++ b/server/src/main/java/org/opensearch/action/support/ActiveShardsObserver.java
@@ -49,6 +49,8 @@
 /**
  * This class provides primitives for waiting for a configured number of shards
  * to become active before sending a response on an {@link ActionListener}.
+ *
+ * @opensearch.internal
  */
 public class ActiveShardsObserver {
 
diff --git a/server/src/main/java/org/opensearch/action/support/AdapterActionFuture.java b/server/src/main/java/org/opensearch/action/support/AdapterActionFuture.java
index aa197d1e255f9..93430a049d3a9 100644
--- a/server/src/main/java/org/opensearch/action/support/AdapterActionFuture.java
+++ b/server/src/main/java/org/opensearch/action/support/AdapterActionFuture.java
@@ -42,6 +42,11 @@
 
 import java.util.concurrent.TimeUnit;
 
+/**
+ * Future adapter action
+ *
+ * @opensearch.internal
+ */
 public abstract class AdapterActionFuture<T, L> extends BaseFuture<T> implements ActionFuture<T>, ActionListener<L> {
 
     @Override
diff --git a/server/src/main/java/org/opensearch/action/support/AutoCreateIndex.java b/server/src/main/java/org/opensearch/action/support/AutoCreateIndex.java
index 322dfc85fbf54..c986730aa74da 100644
--- a/server/src/main/java/org/opensearch/action/support/AutoCreateIndex.java
+++ b/server/src/main/java/org/opensearch/action/support/AutoCreateIndex.java
@@ -52,6 +52,8 @@
 /**
  * Encapsulates the logic of whether a new index should be automatically created when
  * a write operation is about to happen in a non existing index.
+ *
+ * @opensearch.internal
  */
 public final class AutoCreateIndex {
 
diff --git a/server/src/main/java/org/opensearch/action/support/ChannelActionListener.java b/server/src/main/java/org/opensearch/action/support/ChannelActionListener.java
index 288c91b243cb1..5b0475093d3c2 100644
--- a/server/src/main/java/org/opensearch/action/support/ChannelActionListener.java
+++ b/server/src/main/java/org/opensearch/action/support/ChannelActionListener.java
@@ -37,6 +37,11 @@
 import org.opensearch.transport.TransportRequest;
 import org.opensearch.transport.TransportResponse;
 
+/**
+ * Listener for transport channel actions
+ *
+ * @opensearch.internal
+ */
 public final class ChannelActionListener<Response extends TransportResponse, Request extends TransportRequest>
     implements
         ActionListener<Response> {
diff --git a/server/src/main/java/org/opensearch/action/support/ContextPreservingActionListener.java b/server/src/main/java/org/opensearch/action/support/ContextPreservingActionListener.java
index b83e0541cb6d0..6eadc0b67ffbd 100644
--- a/server/src/main/java/org/opensearch/action/support/ContextPreservingActionListener.java
+++ b/server/src/main/java/org/opensearch/action/support/ContextPreservingActionListener.java
@@ -39,6 +39,8 @@
 /**
  * Restores the given {@link org.opensearch.common.util.concurrent.ThreadContext.StoredContext}
  * once the listener is invoked
+ *
+ * @opensearch.internal
  */
 public final class ContextPreservingActionListener<R> implements ActionListener<R> {
 
diff --git a/server/src/main/java/org/opensearch/action/support/DefaultShardOperationFailedException.java b/server/src/main/java/org/opensearch/action/support/DefaultShardOperationFailedException.java
index 19f2c22d79496..1d3b056a7de66 100644
--- a/server/src/main/java/org/opensearch/action/support/DefaultShardOperationFailedException.java
+++ b/server/src/main/java/org/opensearch/action/support/DefaultShardOperationFailedException.java
@@ -49,6 +49,11 @@
 import static org.opensearch.ExceptionsHelper.detailedMessage;
 import static org.opensearch.common.xcontent.ConstructingObjectParser.constructorArg;
 
+/**
+ * Exception for a default shard operation
+ *
+ * @opensearch.internal
+ */
 public class DefaultShardOperationFailedException extends ShardOperationFailedException implements Writeable {
 
     private static final String INDEX = "index";
diff --git a/server/src/main/java/org/opensearch/action/support/DestructiveOperations.java b/server/src/main/java/org/opensearch/action/support/DestructiveOperations.java
index ce9a0d7c7aece..84b3287322301 100644
--- a/server/src/main/java/org/opensearch/action/support/DestructiveOperations.java
+++ b/server/src/main/java/org/opensearch/action/support/DestructiveOperations.java
@@ -39,6 +39,8 @@
 
 /**
  * Helper for dealing with destructive operations and wildcard usage.
+ *
+ * @opensearch.internal
  */
 public final class DestructiveOperations {
 
diff --git a/server/src/main/java/org/opensearch/action/support/GroupedActionListener.java b/server/src/main/java/org/opensearch/action/support/GroupedActionListener.java
index 515ed73ae2392..3d15d63289d9e 100644
--- a/server/src/main/java/org/opensearch/action/support/GroupedActionListener.java
+++ b/server/src/main/java/org/opensearch/action/support/GroupedActionListener.java
@@ -46,6 +46,8 @@
  * it has received N results (either successes or failures). This allows synchronous
  * tasks to be forked off in a loop with the same listener and respond to a
  * higher level listener once all tasks responded.
+ *
+ * @opensearch.internal
  */
 public final class GroupedActionListener<T> implements ActionListener<T> {
     private final CountDown countDown;
diff --git a/server/src/main/java/org/opensearch/action/support/HandledTransportAction.java b/server/src/main/java/org/opensearch/action/support/HandledTransportAction.java
index 9613b55cc7641..e4c6addec40f3 100644
--- a/server/src/main/java/org/opensearch/action/support/HandledTransportAction.java
+++ b/server/src/main/java/org/opensearch/action/support/HandledTransportAction.java
@@ -42,6 +42,8 @@
 
 /**
  * A TransportAction that self registers a handler into the transport service
+ *
+ * @opensearch.internal
  */
 public abstract class HandledTransportAction<Request extends ActionRequest, Response extends ActionResponse> extends TransportAction<
     Request,
diff --git a/server/src/main/java/org/opensearch/action/support/IndicesOptions.java b/server/src/main/java/org/opensearch/action/support/IndicesOptions.java
index 09b691787dffe..292a2c4b7d3da 100644
--- a/server/src/main/java/org/opensearch/action/support/IndicesOptions.java
+++ b/server/src/main/java/org/opensearch/action/support/IndicesOptions.java
@@ -55,6 +55,8 @@
 /**
  * Controls how to deal with unavailable concrete indices (closed or missing), how wildcard expressions are expanded
  * to actual indices (all, closed or open indices) and how to deal with wildcard expressions that resolve to no indices.
+ *
+ * @opensearch.internal
  */
 public class IndicesOptions implements ToXContentFragment {
 
diff --git a/server/src/main/java/org/opensearch/action/support/ListenerTimeouts.java b/server/src/main/java/org/opensearch/action/support/ListenerTimeouts.java
index c31ca9b100624..ffe506905326f 100644
--- a/server/src/main/java/org/opensearch/action/support/ListenerTimeouts.java
+++ b/server/src/main/java/org/opensearch/action/support/ListenerTimeouts.java
@@ -41,6 +41,11 @@
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.function.Consumer;
 
+/**
+ * Supports timeouts on listeners
+ *
+ * @opensearch.internal
+ */
 public class ListenerTimeouts {
 
     /**
diff --git a/server/src/main/java/org/opensearch/action/support/PlainActionFuture.java b/server/src/main/java/org/opensearch/action/support/PlainActionFuture.java
index d7235a3b0ee46..abe63d8abd473 100644
--- a/server/src/main/java/org/opensearch/action/support/PlainActionFuture.java
+++ b/server/src/main/java/org/opensearch/action/support/PlainActionFuture.java
@@ -34,6 +34,11 @@
 
 import org.opensearch.common.CheckedConsumer;
 
+/**
+ * Creates a new future for a plain action.
+ *
+ * @opensearch.internal
+ */
 public class PlainActionFuture<T> extends AdapterActionFuture<T, T> {
 
     public static <T> PlainActionFuture<T> newFuture() {
diff --git a/server/src/main/java/org/opensearch/action/support/PlainListenableActionFuture.java b/server/src/main/java/org/opensearch/action/support/PlainListenableActionFuture.java
index 16a82b91145ae..ac5f7d25efb18 100644
--- a/server/src/main/java/org/opensearch/action/support/PlainListenableActionFuture.java
+++ b/server/src/main/java/org/opensearch/action/support/PlainListenableActionFuture.java
@@ -38,6 +38,11 @@
 import java.util.ArrayList;
 import java.util.List;
 
+/**
+ * Future for a plain listenable action
+ *
+ * @opensearch.internal
+ */
 public class PlainListenableActionFuture<T> extends AdapterActionFuture<T, T> implements ListenableActionFuture<T> {
 
     volatile Object listeners;
diff --git a/server/src/main/java/org/opensearch/action/support/RetryableAction.java b/server/src/main/java/org/opensearch/action/support/RetryableAction.java
index e330948209b5c..38b7e6ec2a8a0 100644
--- a/server/src/main/java/org/opensearch/action/support/RetryableAction.java
+++ b/server/src/main/java/org/opensearch/action/support/RetryableAction.java
@@ -50,6 +50,8 @@
  * The executor the action will be executed on can be defined in the constructor. Otherwise, SAME is the
  * default. The action will be retried with exponentially increasing delay periods until the timeout period
  * has been reached.
+ *
+ * @opensearch.internal
  */
 public abstract class RetryableAction<Response> {
 
diff --git a/server/src/main/java/org/opensearch/action/support/ThreadedActionListener.java b/server/src/main/java/org/opensearch/action/support/ThreadedActionListener.java
index f6a4c87c57344..17ef64aa901c0 100644
--- a/server/src/main/java/org/opensearch/action/support/ThreadedActionListener.java
+++ b/server/src/main/java/org/opensearch/action/support/ThreadedActionListener.java
@@ -41,6 +41,8 @@
 
 /**
  * An action listener that wraps another action listener and threading its execution.
+ *
+ * @opensearch.internal
  */
 public final class ThreadedActionListener<Response> implements ActionListener<Response> {
     private final Logger logger;
diff --git a/server/src/main/java/org/opensearch/action/support/TimeoutTaskCancellationUtility.java b/server/src/main/java/org/opensearch/action/support/TimeoutTaskCancellationUtility.java
index e132555a3c071..759819d803f0e 100644
--- a/server/src/main/java/org/opensearch/action/support/TimeoutTaskCancellationUtility.java
+++ b/server/src/main/java/org/opensearch/action/support/TimeoutTaskCancellationUtility.java
@@ -29,6 +29,11 @@
 import static org.opensearch.action.admin.cluster.node.tasks.get.GetTaskAction.TASKS_ORIGIN;
 import static org.opensearch.action.search.TransportSearchAction.SEARCH_CANCEL_AFTER_TIME_INTERVAL_SETTING;
 
+/**
+ * Utility to cancel a timeout task
+ *
+ * @opensearch.internal
+ */
 public class TimeoutTaskCancellationUtility {
 
     private static final Logger logger = LogManager.getLogger(TimeoutTaskCancellationUtility.class);
diff --git a/server/src/main/java/org/opensearch/action/support/TransportAction.java b/server/src/main/java/org/opensearch/action/support/TransportAction.java
index 84ece8cfec530..edcef8ef0c5fd 100644
--- a/server/src/main/java/org/opensearch/action/support/TransportAction.java
+++ b/server/src/main/java/org/opensearch/action/support/TransportAction.java
@@ -48,6 +48,11 @@
 
 import java.util.concurrent.atomic.AtomicInteger;
 
+/**
+ * Base class for a transport action
+ *
+ * @opensearch.internal
+ */
 public abstract class TransportAction<Request extends ActionRequest, Response extends ActionResponse> {
 
     public final String actionName;
diff --git a/server/src/main/java/org/opensearch/action/support/TransportActions.java b/server/src/main/java/org/opensearch/action/support/TransportActions.java
index d79059d39f407..03e7509b3b8e3 100644
--- a/server/src/main/java/org/opensearch/action/support/TransportActions.java
+++ b/server/src/main/java/org/opensearch/action/support/TransportActions.java
@@ -40,6 +40,11 @@
 import org.opensearch.index.shard.IllegalIndexShardStateException;
 import org.opensearch.index.shard.ShardNotFoundException;
 
+/**
+ * Utility class for transport actions
+ *
+ * @opensearch.internal
+ */
 public class TransportActions {
 
     public static boolean isShardNotAvailableException(final Throwable e) {
diff --git a/server/src/main/java/org/opensearch/action/support/WriteRequest.java b/server/src/main/java/org/opensearch/action/support/WriteRequest.java
index 65737ffedeecb..81faf9a8f88ca 100644
--- a/server/src/main/java/org/opensearch/action/support/WriteRequest.java
+++ b/server/src/main/java/org/opensearch/action/support/WriteRequest.java
@@ -46,6 +46,8 @@
 /**
  * Interface implemented by requests that modify the documents in an index like {@link IndexRequest}, {@link UpdateRequest}, and
  * {@link BulkRequest}. Rather than implement this directly most implementers should extend {@link ReplicatedWriteRequest}.
+ *
+ * @opensearch.internal
  */
 public interface WriteRequest<R extends WriteRequest<R>> extends Writeable {
     /**
diff --git a/server/src/main/java/org/opensearch/action/support/WriteRequestBuilder.java b/server/src/main/java/org/opensearch/action/support/WriteRequestBuilder.java
index c26a08ad6ab60..899d7a8cd65fe 100644
--- a/server/src/main/java/org/opensearch/action/support/WriteRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/support/WriteRequestBuilder.java
@@ -34,6 +34,11 @@
 
 import org.opensearch.action.support.WriteRequest.RefreshPolicy;
 
+/**
+ * Builder for a write request operations
+ *
+ * @opensearch.internal
+ */
 public interface WriteRequestBuilder<B extends WriteRequestBuilder<B>> {
     WriteRequest<?> request();
 
diff --git a/server/src/main/java/org/opensearch/action/support/WriteResponse.java b/server/src/main/java/org/opensearch/action/support/WriteResponse.java
index 89b04bbdb8362..786f851d88542 100644
--- a/server/src/main/java/org/opensearch/action/support/WriteResponse.java
+++ b/server/src/main/java/org/opensearch/action/support/WriteResponse.java
@@ -42,6 +42,8 @@
 /**
  * Interface implemented by responses for actions that modify the documents in an index like {@link IndexResponse}, {@link UpdateResponse},
  * and {@link BulkResponse}. Rather than implement this directly most implementers should extend {@link DocWriteResponse}.
+ *
+ * @opensearch.internal
  */
 public interface WriteResponse {
     /**
diff --git a/server/src/main/java/org/opensearch/action/support/broadcast/BroadcastOperationRequestBuilder.java b/server/src/main/java/org/opensearch/action/support/broadcast/BroadcastOperationRequestBuilder.java
index 2eaa029e687f4..d732a28c32ea3 100644
--- a/server/src/main/java/org/opensearch/action/support/broadcast/BroadcastOperationRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/support/broadcast/BroadcastOperationRequestBuilder.java
@@ -37,6 +37,11 @@
 import org.opensearch.action.support.IndicesOptions;
 import org.opensearch.client.OpenSearchClient;
 
+/**
+ * Request builder for broadcast operations
+ *
+ * @opensearch.internal
+ */
 public abstract class BroadcastOperationRequestBuilder<
     Request extends BroadcastRequest<Request>,
     Response extends BroadcastResponse,
diff --git a/server/src/main/java/org/opensearch/action/support/broadcast/BroadcastRequest.java b/server/src/main/java/org/opensearch/action/support/broadcast/BroadcastRequest.java
index 457f97acbe98b..84cb2965e6e61 100644
--- a/server/src/main/java/org/opensearch/action/support/broadcast/BroadcastRequest.java
+++ b/server/src/main/java/org/opensearch/action/support/broadcast/BroadcastRequest.java
@@ -42,6 +42,11 @@
 
 import java.io.IOException;
 
+/**
+ * Transport request for broadcast operations
+ *
+ * @opensearch.internal
+ */
 public class BroadcastRequest<Request extends BroadcastRequest<Request>> extends ActionRequest implements IndicesRequest.Replaceable {
 
     protected String[] indices;
diff --git a/server/src/main/java/org/opensearch/action/support/broadcast/BroadcastResponse.java b/server/src/main/java/org/opensearch/action/support/broadcast/BroadcastResponse.java
index 89dcec7bf75ae..9d0973a5f7307 100644
--- a/server/src/main/java/org/opensearch/action/support/broadcast/BroadcastResponse.java
+++ b/server/src/main/java/org/opensearch/action/support/broadcast/BroadcastResponse.java
@@ -52,6 +52,8 @@
 
 /**
  * Base class for all broadcast operation based responses.
+ *
+ * @opensearch.internal
  */
 public class BroadcastResponse extends ActionResponse implements ToXContentObject {
 
diff --git a/server/src/main/java/org/opensearch/action/support/broadcast/BroadcastShardOperationFailedException.java b/server/src/main/java/org/opensearch/action/support/broadcast/BroadcastShardOperationFailedException.java
index f91de7f3ced7a..ed84b48f38387 100644
--- a/server/src/main/java/org/opensearch/action/support/broadcast/BroadcastShardOperationFailedException.java
+++ b/server/src/main/java/org/opensearch/action/support/broadcast/BroadcastShardOperationFailedException.java
@@ -42,7 +42,7 @@
 /**
  * An exception indicating that a failure occurred performing an operation on the shard.
  *
- *
+ * @opensearch.internal
  */
 public class BroadcastShardOperationFailedException extends OpenSearchException implements OpenSearchWrapperException {
 
diff --git a/server/src/main/java/org/opensearch/action/support/broadcast/BroadcastShardRequest.java b/server/src/main/java/org/opensearch/action/support/broadcast/BroadcastShardRequest.java
index e89a1437784b9..02fc305d4eb0d 100644
--- a/server/src/main/java/org/opensearch/action/support/broadcast/BroadcastShardRequest.java
+++ b/server/src/main/java/org/opensearch/action/support/broadcast/BroadcastShardRequest.java
@@ -42,6 +42,11 @@
 
 import java.io.IOException;
 
+/**
+ * Base class for broadcasting shard requests
+ *
+ * @opensearch.internal
+ */
 public abstract class BroadcastShardRequest extends TransportRequest implements IndicesRequest {
 
     private ShardId shardId;
diff --git a/server/src/main/java/org/opensearch/action/support/broadcast/BroadcastShardResponse.java b/server/src/main/java/org/opensearch/action/support/broadcast/BroadcastShardResponse.java
index 96245ec4d91f1..b3045d52450cc 100644
--- a/server/src/main/java/org/opensearch/action/support/broadcast/BroadcastShardResponse.java
+++ b/server/src/main/java/org/opensearch/action/support/broadcast/BroadcastShardResponse.java
@@ -39,6 +39,11 @@
 
 import java.io.IOException;
 
+/**
+ * Base class for broadcasting response
+ *
+ * @opensearch.internal
+ */
 public abstract class BroadcastShardResponse extends TransportResponse {
 
     ShardId shardId;
diff --git a/server/src/main/java/org/opensearch/action/support/broadcast/TransportBroadcastAction.java b/server/src/main/java/org/opensearch/action/support/broadcast/TransportBroadcastAction.java
index 32dda0af3970d..728497af8d0d5 100644
--- a/server/src/main/java/org/opensearch/action/support/broadcast/TransportBroadcastAction.java
+++ b/server/src/main/java/org/opensearch/action/support/broadcast/TransportBroadcastAction.java
@@ -63,6 +63,11 @@
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicReferenceArray;
 
+/**
+ * Base transport broadcast action class
+ *
+ * @opensearch.internal
+ */
 public abstract class TransportBroadcastAction<
     Request extends BroadcastRequest<Request>,
     Response extends BroadcastResponse,
diff --git a/server/src/main/java/org/opensearch/action/support/broadcast/node/TransportBroadcastByNodeAction.java b/server/src/main/java/org/opensearch/action/support/broadcast/node/TransportBroadcastByNodeAction.java
index 3950f3a9fef77..c04e5ecf25e57 100644
--- a/server/src/main/java/org/opensearch/action/support/broadcast/node/TransportBroadcastByNodeAction.java
+++ b/server/src/main/java/org/opensearch/action/support/broadcast/node/TransportBroadcastByNodeAction.java
@@ -86,6 +86,8 @@
  * @param <Request>              the underlying client request
  * @param <Response>             the response to the client request
  * @param <ShardOperationResult> per-shard operation results
+ *
+ * @opensearch.internal
  */
 public abstract class TransportBroadcastByNodeAction<
     Request extends BroadcastRequest<Request>,
diff --git a/server/src/main/java/org/opensearch/action/support/master/AcknowledgedRequest.java b/server/src/main/java/org/opensearch/action/support/master/AcknowledgedRequest.java
index 278c4f287b4f5..7f665b4e658a1 100644
--- a/server/src/main/java/org/opensearch/action/support/master/AcknowledgedRequest.java
+++ b/server/src/main/java/org/opensearch/action/support/master/AcknowledgedRequest.java
@@ -43,6 +43,8 @@
 /**
  * Abstract class that allows to mark action requests that support acknowledgements.
  * Facilitates consistency across different api.
+ *
+ * @opensearch.internal
  */
 public abstract class AcknowledgedRequest<Request extends MasterNodeRequest<Request>> extends MasterNodeRequest<Request>
     implements
diff --git a/server/src/main/java/org/opensearch/action/support/master/AcknowledgedRequestBuilder.java b/server/src/main/java/org/opensearch/action/support/master/AcknowledgedRequestBuilder.java
index 9337e646cebea..7a0824c6d30ca 100644
--- a/server/src/main/java/org/opensearch/action/support/master/AcknowledgedRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/support/master/AcknowledgedRequestBuilder.java
@@ -36,7 +36,9 @@
 import org.opensearch.common.unit.TimeValue;
 
 /**
- * Base request builder for master node operations that support acknowledgements
+ * Base request builder for cluster-manager node operations that support acknowledgements
+ *
+ * @opensearch.internal
  */
 public abstract class AcknowledgedRequestBuilder<
     Request extends AcknowledgedRequest<Request>,
diff --git a/server/src/main/java/org/opensearch/action/support/master/AcknowledgedResponse.java b/server/src/main/java/org/opensearch/action/support/master/AcknowledgedResponse.java
index dca3096b99440..415e52b68e368 100644
--- a/server/src/main/java/org/opensearch/action/support/master/AcknowledgedResponse.java
+++ b/server/src/main/java/org/opensearch/action/support/master/AcknowledgedResponse.java
@@ -48,6 +48,8 @@
 
 /**
  * A response that indicates that a request has been acknowledged
+ *
+ * @opensearch.internal
  */
 public class AcknowledgedResponse extends ActionResponse implements ToXContentObject {
 
diff --git a/server/src/main/java/org/opensearch/action/support/master/MasterNodeOperationRequestBuilder.java b/server/src/main/java/org/opensearch/action/support/master/MasterNodeOperationRequestBuilder.java
index b39ec5fe4cc6b..b54aa11ecad38 100644
--- a/server/src/main/java/org/opensearch/action/support/master/MasterNodeOperationRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/support/master/MasterNodeOperationRequestBuilder.java
@@ -39,7 +39,9 @@
 import org.opensearch.common.unit.TimeValue;
 
 /**
- * Base request builder for master node operations
+ * Base request builder for cluster-manager node operations
+ *
+ * @opensearch.internal
  */
 public abstract class MasterNodeOperationRequestBuilder<
     Request extends MasterNodeRequest<Request>,
diff --git a/server/src/main/java/org/opensearch/action/support/master/MasterNodeReadOperationRequestBuilder.java b/server/src/main/java/org/opensearch/action/support/master/MasterNodeReadOperationRequestBuilder.java
index add5c5177df42..d36b419577cab 100644
--- a/server/src/main/java/org/opensearch/action/support/master/MasterNodeReadOperationRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/support/master/MasterNodeReadOperationRequestBuilder.java
@@ -37,7 +37,9 @@
 import org.opensearch.client.OpenSearchClient;
 
 /**
- * Base request builder for master node read operations that can be executed on the local node as well
+ * Base request builder for cluster-manager node read operations that can be executed on the local node as well
+ *
+ * @opensearch.internal
  */
 public abstract class MasterNodeReadOperationRequestBuilder<
     Request extends MasterNodeReadRequest<Request>,
diff --git a/server/src/main/java/org/opensearch/action/support/master/MasterNodeReadRequest.java b/server/src/main/java/org/opensearch/action/support/master/MasterNodeReadRequest.java
index eeafa148ca7c3..3a84f76674bff 100644
--- a/server/src/main/java/org/opensearch/action/support/master/MasterNodeReadRequest.java
+++ b/server/src/main/java/org/opensearch/action/support/master/MasterNodeReadRequest.java
@@ -38,7 +38,9 @@
 import java.io.IOException;
 
 /**
- * Base request for master based read operations that allows to read the cluster state from the local node if needed
+ * Base request for cluster-manager based read operations that allows to read the cluster state from the local node if needed
+ *
+ * @opensearch.internal
  */
 public abstract class MasterNodeReadRequest<Request extends MasterNodeReadRequest<Request>> extends MasterNodeRequest<Request> {
 
diff --git a/server/src/main/java/org/opensearch/action/support/master/MasterNodeRequest.java b/server/src/main/java/org/opensearch/action/support/master/MasterNodeRequest.java
index d5be6c48e23b8..8b1bce8c003eb 100644
--- a/server/src/main/java/org/opensearch/action/support/master/MasterNodeRequest.java
+++ b/server/src/main/java/org/opensearch/action/support/master/MasterNodeRequest.java
@@ -40,7 +40,9 @@
 import java.io.IOException;
 
 /**
- * A based request for master based operation.
+ * A based request for cluster-manager based operation.
+ *
+ * @opensearch.internal
  */
 public abstract class MasterNodeRequest<Request extends MasterNodeRequest<Request>> extends ActionRequest {
 
diff --git a/server/src/main/java/org/opensearch/action/support/master/ShardsAcknowledgedResponse.java b/server/src/main/java/org/opensearch/action/support/master/ShardsAcknowledgedResponse.java
index 5964867d2d618..d100874296844 100644
--- a/server/src/main/java/org/opensearch/action/support/master/ShardsAcknowledgedResponse.java
+++ b/server/src/main/java/org/opensearch/action/support/master/ShardsAcknowledgedResponse.java
@@ -44,6 +44,11 @@
 
 import static org.opensearch.common.xcontent.ConstructingObjectParser.constructorArg;
 
+/**
+ * Transport response for shard acknowledgements
+ *
+ * @opensearch.internal
+ */
 public abstract class ShardsAcknowledgedResponse extends AcknowledgedResponse {
 
     protected static final ParseField SHARDS_ACKNOWLEDGED = new ParseField("shards_acknowledged");
diff --git a/server/src/main/java/org/opensearch/action/support/master/TransportMasterNodeAction.java b/server/src/main/java/org/opensearch/action/support/master/TransportMasterNodeAction.java
index 76babf2ea5d1d..844e7d6d43583 100644
--- a/server/src/main/java/org/opensearch/action/support/master/TransportMasterNodeAction.java
+++ b/server/src/main/java/org/opensearch/action/support/master/TransportMasterNodeAction.java
@@ -67,7 +67,9 @@
 import java.util.function.Predicate;
 
 /**
- * A base class for operations that needs to be performed on the master node.
+ * A base class for operations that needs to be performed on the cluster-manager node.
+ *
+ * @opensearch.internal
  */
 public abstract class TransportMasterNodeAction<Request extends MasterNodeRequest<Request>, Response extends ActionResponse> extends
     HandledTransportAction<Request, Response> {
diff --git a/server/src/main/java/org/opensearch/action/support/master/TransportMasterNodeReadAction.java b/server/src/main/java/org/opensearch/action/support/master/TransportMasterNodeReadAction.java
index b230901eb456e..cf5543b32c750 100644
--- a/server/src/main/java/org/opensearch/action/support/master/TransportMasterNodeReadAction.java
+++ b/server/src/main/java/org/opensearch/action/support/master/TransportMasterNodeReadAction.java
@@ -43,6 +43,8 @@
 /**
  * A base class for read operations that needs to be performed on the master node.
  * Can also be executed on the local node if needed.
+ *
+ * @opensearch.internal
  */
 public abstract class TransportMasterNodeReadAction<Request extends MasterNodeReadRequest<Request>, Response extends ActionResponse> extends
     TransportMasterNodeAction<Request, Response> {
diff --git a/server/src/main/java/org/opensearch/action/support/master/info/ClusterInfoRequest.java b/server/src/main/java/org/opensearch/action/support/master/info/ClusterInfoRequest.java
index 0b392caa3e588..ae3b2350f574c 100644
--- a/server/src/main/java/org/opensearch/action/support/master/info/ClusterInfoRequest.java
+++ b/server/src/main/java/org/opensearch/action/support/master/info/ClusterInfoRequest.java
@@ -42,6 +42,11 @@
 
 import java.io.IOException;
 
+/**
+ * Transport request for cluster information
+ *
+ * @opensearch.internal
+ */
 public abstract class ClusterInfoRequest<Request extends ClusterInfoRequest<Request>> extends MasterNodeReadRequest<Request>
     implements
         IndicesRequest.Replaceable {
diff --git a/server/src/main/java/org/opensearch/action/support/master/info/ClusterInfoRequestBuilder.java b/server/src/main/java/org/opensearch/action/support/master/info/ClusterInfoRequestBuilder.java
index d806f96eb9ff2..09ed9b590d9c4 100644
--- a/server/src/main/java/org/opensearch/action/support/master/info/ClusterInfoRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/support/master/info/ClusterInfoRequestBuilder.java
@@ -38,6 +38,11 @@
 import org.opensearch.client.OpenSearchClient;
 import org.opensearch.common.util.ArrayUtils;
 
+/**
+ * Transport request builder for cluster information
+ *
+ * @opensearch.internal
+ */
 public abstract class ClusterInfoRequestBuilder<
     Request extends ClusterInfoRequest<Request>,
     Response extends ActionResponse,
diff --git a/server/src/main/java/org/opensearch/action/support/master/info/TransportClusterInfoAction.java b/server/src/main/java/org/opensearch/action/support/master/info/TransportClusterInfoAction.java
index 9bcfaea056a89..e3ad4afcad02e 100644
--- a/server/src/main/java/org/opensearch/action/support/master/info/TransportClusterInfoAction.java
+++ b/server/src/main/java/org/opensearch/action/support/master/info/TransportClusterInfoAction.java
@@ -44,6 +44,11 @@
 import org.opensearch.threadpool.ThreadPool;
 import org.opensearch.transport.TransportService;
 
+/**
+ * Perform cluster information action
+ *
+ * @opensearch.internal
+ */
 public abstract class TransportClusterInfoAction<Request extends ClusterInfoRequest<Request>, Response extends ActionResponse> extends
     TransportMasterNodeReadAction<Request, Response> {
 
diff --git a/server/src/main/java/org/opensearch/action/support/nodes/BaseNodeRequest.java b/server/src/main/java/org/opensearch/action/support/nodes/BaseNodeRequest.java
index e91a659d331d1..b5ff1d60ff75b 100644
--- a/server/src/main/java/org/opensearch/action/support/nodes/BaseNodeRequest.java
+++ b/server/src/main/java/org/opensearch/action/support/nodes/BaseNodeRequest.java
@@ -39,7 +39,15 @@
 
 import java.io.IOException;
 
-// TODO: this class can be removed in master once 7.x is bumped to 7.4.0
+/**
+ * Base class for node transport requests
+ *
+ * @opensearch.internal
+ *
+ * @deprecated this class is deprecated and classes will extend TransportRequest directly
+ */
+// TODO: this class can be removed in main once 7.x is bumped to 7.4.0
+@Deprecated
 public abstract class BaseNodeRequest extends TransportRequest {
 
     public BaseNodeRequest() {}
diff --git a/server/src/main/java/org/opensearch/action/support/nodes/BaseNodeResponse.java b/server/src/main/java/org/opensearch/action/support/nodes/BaseNodeResponse.java
index 13d9293c21123..62e814d7e7ec0 100644
--- a/server/src/main/java/org/opensearch/action/support/nodes/BaseNodeResponse.java
+++ b/server/src/main/java/org/opensearch/action/support/nodes/BaseNodeResponse.java
@@ -41,6 +41,8 @@
 
 /**
  * A base class for node level operations.
+ *
+ * @opensearch.internal
  */
 public abstract class BaseNodeResponse extends TransportResponse {
 
diff --git a/server/src/main/java/org/opensearch/action/support/nodes/BaseNodesRequest.java b/server/src/main/java/org/opensearch/action/support/nodes/BaseNodesRequest.java
index b36fc585e99a8..f4b25a43dc206 100644
--- a/server/src/main/java/org/opensearch/action/support/nodes/BaseNodesRequest.java
+++ b/server/src/main/java/org/opensearch/action/support/nodes/BaseNodesRequest.java
@@ -42,6 +42,11 @@
 
 import java.io.IOException;
 
+/**
+ * Base class for requests targeting a list of nodes
+ *
+ * @opensearch.internal
+ */
 public abstract class BaseNodesRequest<Request extends BaseNodesRequest<Request>> extends ActionRequest {
 
     /**
diff --git a/server/src/main/java/org/opensearch/action/support/nodes/BaseNodesResponse.java b/server/src/main/java/org/opensearch/action/support/nodes/BaseNodesResponse.java
index 2ba00d77d0660..a47eb4be898ca 100644
--- a/server/src/main/java/org/opensearch/action/support/nodes/BaseNodesResponse.java
+++ b/server/src/main/java/org/opensearch/action/support/nodes/BaseNodesResponse.java
@@ -44,6 +44,11 @@
 import java.util.Map;
 import java.util.Objects;
 
+/**
+ * Transport response for nodes requests
+ *
+ * @opensearch.internal
+ */
 public abstract class BaseNodesResponse<TNodeResponse extends BaseNodeResponse> extends ActionResponse {
 
     private ClusterName clusterName;
diff --git a/server/src/main/java/org/opensearch/action/support/nodes/NodesOperationRequestBuilder.java b/server/src/main/java/org/opensearch/action/support/nodes/NodesOperationRequestBuilder.java
index d8017ace7d3e6..9d5e1b3ab4ed4 100644
--- a/server/src/main/java/org/opensearch/action/support/nodes/NodesOperationRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/support/nodes/NodesOperationRequestBuilder.java
@@ -37,6 +37,11 @@
 import org.opensearch.client.OpenSearchClient;
 import org.opensearch.common.unit.TimeValue;
 
+/**
+ * Builder for Operation Requests
+ *
+ * @opensearch.internal
+ */
 public abstract class NodesOperationRequestBuilder<
     Request extends BaseNodesRequest<Request>,
     Response extends BaseNodesResponse,
diff --git a/server/src/main/java/org/opensearch/action/support/nodes/TransportNodesAction.java b/server/src/main/java/org/opensearch/action/support/nodes/TransportNodesAction.java
index 030b14678c0e5..614740e6bc8a1 100644
--- a/server/src/main/java/org/opensearch/action/support/nodes/TransportNodesAction.java
+++ b/server/src/main/java/org/opensearch/action/support/nodes/TransportNodesAction.java
@@ -62,6 +62,11 @@
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicReferenceArray;
 
+/**
+ * Base action class for transport nodes
+ *
+ * @opensearch.internal
+ */
 public abstract class TransportNodesAction<
     NodesRequest extends BaseNodesRequest<NodesRequest>,
     NodesResponse extends BaseNodesResponse,
diff --git a/server/src/main/java/org/opensearch/action/support/replication/BasicReplicationRequest.java b/server/src/main/java/org/opensearch/action/support/replication/BasicReplicationRequest.java
index 1022a476bf885..bd0663fc3d352 100644
--- a/server/src/main/java/org/opensearch/action/support/replication/BasicReplicationRequest.java
+++ b/server/src/main/java/org/opensearch/action/support/replication/BasicReplicationRequest.java
@@ -42,6 +42,8 @@
  * Unfortunately ReplicationRequest can't be declared as a type parameter
  * because it has a self referential type parameter of its own. So use this
  * instead.
+ *
+ * @opensearch.internal
  */
 public class BasicReplicationRequest extends ReplicationRequest<BasicReplicationRequest> {
     /**
diff --git a/server/src/main/java/org/opensearch/action/support/replication/PendingReplicationActions.java b/server/src/main/java/org/opensearch/action/support/replication/PendingReplicationActions.java
index 1e554913e527d..b305c4c8c83a7 100644
--- a/server/src/main/java/org/opensearch/action/support/replication/PendingReplicationActions.java
+++ b/server/src/main/java/org/opensearch/action/support/replication/PendingReplicationActions.java
@@ -46,6 +46,11 @@
 import java.util.Set;
 import java.util.function.Consumer;
 
+/**
+ * Pending Replication Actions
+ *
+ * @opensearch.internal
+ */
 public class PendingReplicationActions implements Consumer<ReplicationGroup>, Releasable {
 
     private final Map<String, Set<RetryableAction<?>>> onGoingReplicationActions = ConcurrentCollections.newConcurrentMap();
diff --git a/server/src/main/java/org/opensearch/action/support/replication/ReplicatedWriteRequest.java b/server/src/main/java/org/opensearch/action/support/replication/ReplicatedWriteRequest.java
index e18765d7a3546..8018de175b47e 100644
--- a/server/src/main/java/org/opensearch/action/support/replication/ReplicatedWriteRequest.java
+++ b/server/src/main/java/org/opensearch/action/support/replication/ReplicatedWriteRequest.java
@@ -46,6 +46,8 @@
 /**
  * Requests that are both {@linkplain ReplicationRequest}s (run on a shard's primary first, then the replica) and {@linkplain WriteRequest}
  * (modify documents on a shard), for example {@link BulkShardRequest}, {@link IndexRequest}, and {@link DeleteRequest}.
+ *
+ * @opensearch.internal
  */
 public abstract class ReplicatedWriteRequest<R extends ReplicatedWriteRequest<R>> extends ReplicationRequest<R> implements WriteRequest<R> {
     private RefreshPolicy refreshPolicy = RefreshPolicy.NONE;
diff --git a/server/src/main/java/org/opensearch/action/support/replication/ReplicationOperation.java b/server/src/main/java/org/opensearch/action/support/replication/ReplicationOperation.java
index 68c5416f3603e..50a2dace5b6fe 100644
--- a/server/src/main/java/org/opensearch/action/support/replication/ReplicationOperation.java
+++ b/server/src/main/java/org/opensearch/action/support/replication/ReplicationOperation.java
@@ -67,6 +67,11 @@
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.function.LongSupplier;
 
+/**
+ * Operation for a replication request
+ *
+ * @opensearch.internal
+ */
 public class ReplicationOperation<
     Request extends ReplicationRequest<Request>,
     ReplicaRequest extends ReplicationRequest<ReplicaRequest>,
diff --git a/server/src/main/java/org/opensearch/action/support/replication/ReplicationRequest.java b/server/src/main/java/org/opensearch/action/support/replication/ReplicationRequest.java
index e7428e2913f1a..72214e73b9180 100644
--- a/server/src/main/java/org/opensearch/action/support/replication/ReplicationRequest.java
+++ b/server/src/main/java/org/opensearch/action/support/replication/ReplicationRequest.java
@@ -56,6 +56,8 @@
 /**
  * Requests that are run on a particular replica, first on the primary and then on the replicas like {@link IndexRequest} or
  * {@link TransportShardRefreshAction}.
+ *
+ * @opensearch.internal
  */
 public abstract class ReplicationRequest<Request extends ReplicationRequest<Request>> extends ActionRequest implements IndicesRequest {
 
diff --git a/server/src/main/java/org/opensearch/action/support/replication/ReplicationRequestBuilder.java b/server/src/main/java/org/opensearch/action/support/replication/ReplicationRequestBuilder.java
index 1994c70aec17c..df60e585e7272 100644
--- a/server/src/main/java/org/opensearch/action/support/replication/ReplicationRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/support/replication/ReplicationRequestBuilder.java
@@ -39,6 +39,11 @@
 import org.opensearch.client.OpenSearchClient;
 import org.opensearch.common.unit.TimeValue;
 
+/**
+ * Transport request builder for a replication operation
+ *
+ * @opensearch.internal
+ */
 public abstract class ReplicationRequestBuilder<
     Request extends ReplicationRequest<Request>,
     Response extends ActionResponse,
diff --git a/server/src/main/java/org/opensearch/action/support/replication/ReplicationResponse.java b/server/src/main/java/org/opensearch/action/support/replication/ReplicationResponse.java
index 6434d36861c6f..38fa7ac7520e5 100644
--- a/server/src/main/java/org/opensearch/action/support/replication/ReplicationResponse.java
+++ b/server/src/main/java/org/opensearch/action/support/replication/ReplicationResponse.java
@@ -56,6 +56,8 @@
 
 /**
  * Base class for write action responses.
+ *
+ * @opensearch.internal
  */
 public class ReplicationResponse extends ActionResponse {
 
diff --git a/server/src/main/java/org/opensearch/action/support/replication/ReplicationTask.java b/server/src/main/java/org/opensearch/action/support/replication/ReplicationTask.java
index b24dcd0648043..6fe658d338fae 100644
--- a/server/src/main/java/org/opensearch/action/support/replication/ReplicationTask.java
+++ b/server/src/main/java/org/opensearch/action/support/replication/ReplicationTask.java
@@ -46,6 +46,8 @@
 
 /**
  * Task that tracks replication actions.
+ *
+ * @opensearch.internal
  */
 public class ReplicationTask extends Task {
     private volatile String phase = "starting";
diff --git a/server/src/main/java/org/opensearch/action/support/replication/TransportBroadcastReplicationAction.java b/server/src/main/java/org/opensearch/action/support/replication/TransportBroadcastReplicationAction.java
index dd1ce9f70a28a..b4bacefad8ad2 100644
--- a/server/src/main/java/org/opensearch/action/support/replication/TransportBroadcastReplicationAction.java
+++ b/server/src/main/java/org/opensearch/action/support/replication/TransportBroadcastReplicationAction.java
@@ -61,6 +61,8 @@
 /**
  * Base class for requests that should be executed on all shards of an index or several indices.
  * This action sends shard requests to all primary shards of the indices and they are then replicated like write requests
+ *
+ * @opensearch.internal
  */
 public abstract class TransportBroadcastReplicationAction<
     Request extends BroadcastRequest<Request>,
diff --git a/server/src/main/java/org/opensearch/action/support/replication/TransportReplicationAction.java b/server/src/main/java/org/opensearch/action/support/replication/TransportReplicationAction.java
index 0ea08eccae33d..476b679fedaf6 100644
--- a/server/src/main/java/org/opensearch/action/support/replication/TransportReplicationAction.java
+++ b/server/src/main/java/org/opensearch/action/support/replication/TransportReplicationAction.java
@@ -103,6 +103,8 @@
  * The action samples cluster state on the receiving node to reroute to node with primary copy and on the
  * primary node to validate request before primary operation followed by sampling state again for resolving
  * nodes with replica copies to perform replication.
+ *
+ * @opensearch.internal
  */
 public abstract class TransportReplicationAction<
     Request extends ReplicationRequest<Request>,
diff --git a/server/src/main/java/org/opensearch/action/support/replication/TransportWriteAction.java b/server/src/main/java/org/opensearch/action/support/replication/TransportWriteAction.java
index c9fb959306b9c..2104f60c2fd32 100644
--- a/server/src/main/java/org/opensearch/action/support/replication/TransportWriteAction.java
+++ b/server/src/main/java/org/opensearch/action/support/replication/TransportWriteAction.java
@@ -69,6 +69,8 @@
 /**
  * Base class for transport actions that modify data in some shard like index, delete, and shardBulk.
  * Allows performing async actions (e.g. refresh) after performing write operations on primary and replica shards
+ *
+ * @opensearch.internal
  */
 public abstract class TransportWriteAction<
     Request extends ReplicatedWriteRequest<Request>,
diff --git a/server/src/main/java/org/opensearch/action/support/single/instance/InstanceShardOperationRequest.java b/server/src/main/java/org/opensearch/action/support/single/instance/InstanceShardOperationRequest.java
index 0dd72671fb8c3..85c15e1a01921 100644
--- a/server/src/main/java/org/opensearch/action/support/single/instance/InstanceShardOperationRequest.java
+++ b/server/src/main/java/org/opensearch/action/support/single/instance/InstanceShardOperationRequest.java
@@ -46,8 +46,13 @@
 import java.io.IOException;
 import java.util.concurrent.TimeUnit;
 
+/**
+ * Transport Request for an Index Shard Operation
+ *
+ * @opensearch.internal
+ */
 // TODO: This request and its associated transport action can be folded into UpdateRequest which is its only concrete production code
-//       implementation
+// implementation
 public abstract class InstanceShardOperationRequest<Request extends InstanceShardOperationRequest<Request>> extends ActionRequest
     implements
         IndicesRequest {
diff --git a/server/src/main/java/org/opensearch/action/support/single/instance/InstanceShardOperationRequestBuilder.java b/server/src/main/java/org/opensearch/action/support/single/instance/InstanceShardOperationRequestBuilder.java
index 7bbbd7d11e6ab..6fe7b503e4602 100644
--- a/server/src/main/java/org/opensearch/action/support/single/instance/InstanceShardOperationRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/support/single/instance/InstanceShardOperationRequestBuilder.java
@@ -38,6 +38,11 @@
 import org.opensearch.client.OpenSearchClient;
 import org.opensearch.common.unit.TimeValue;
 
+/**
+ * Request builder for a shard operation
+ *
+ * @opensearch.internal
+ */
 public abstract class InstanceShardOperationRequestBuilder<
     Request extends InstanceShardOperationRequest<Request>,
     Response extends ActionResponse,
diff --git a/server/src/main/java/org/opensearch/action/support/single/instance/TransportInstanceSingleOperationAction.java b/server/src/main/java/org/opensearch/action/support/single/instance/TransportInstanceSingleOperationAction.java
index f91b2e8ce2e98..a6a16157ed264 100644
--- a/server/src/main/java/org/opensearch/action/support/single/instance/TransportInstanceSingleOperationAction.java
+++ b/server/src/main/java/org/opensearch/action/support/single/instance/TransportInstanceSingleOperationAction.java
@@ -69,6 +69,11 @@
 
 import static org.opensearch.cluster.metadata.IndexNameExpressionResolver.EXCLUDED_DATA_STREAMS_KEY;
 
+/**
+ * Base class for a single operation action
+ *
+ * @opensearch.internal
+ */
 public abstract class TransportInstanceSingleOperationAction<
     Request extends InstanceShardOperationRequest<Request>,
     Response extends ActionResponse> extends HandledTransportAction<Request, Response> {
diff --git a/server/src/main/java/org/opensearch/action/support/single/shard/SingleShardOperationRequestBuilder.java b/server/src/main/java/org/opensearch/action/support/single/shard/SingleShardOperationRequestBuilder.java
index d981bfaf60f2c..cf93947cd4afe 100644
--- a/server/src/main/java/org/opensearch/action/support/single/shard/SingleShardOperationRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/support/single/shard/SingleShardOperationRequestBuilder.java
@@ -37,6 +37,11 @@
 import org.opensearch.action.ActionResponse;
 import org.opensearch.client.OpenSearchClient;
 
+/**
+ * Request builder for a single shard operation request
+ *
+ * @opensearch.internal
+ */
 public abstract class SingleShardOperationRequestBuilder<
     Request extends SingleShardRequest<Request>,
     Response extends ActionResponse,
diff --git a/server/src/main/java/org/opensearch/action/support/single/shard/SingleShardRequest.java b/server/src/main/java/org/opensearch/action/support/single/shard/SingleShardRequest.java
index faae069b4b7fa..61777e2b7bae2 100644
--- a/server/src/main/java/org/opensearch/action/support/single/shard/SingleShardRequest.java
+++ b/server/src/main/java/org/opensearch/action/support/single/shard/SingleShardRequest.java
@@ -44,6 +44,11 @@
 
 import java.io.IOException;
 
+/**
+ * Single shard request.
+ *
+ * @opensearch.internal
+ */
 public abstract class SingleShardRequest<Request extends SingleShardRequest<Request>> extends ActionRequest implements IndicesRequest {
 
     public static final IndicesOptions INDICES_OPTIONS = IndicesOptions.strictSingleIndexNoExpandForbidClosed();
diff --git a/server/src/main/java/org/opensearch/action/support/single/shard/TransportSingleShardAction.java b/server/src/main/java/org/opensearch/action/support/single/shard/TransportSingleShardAction.java
index 2a03abac733cd..679360360eed4 100644
--- a/server/src/main/java/org/opensearch/action/support/single/shard/TransportSingleShardAction.java
+++ b/server/src/main/java/org/opensearch/action/support/single/shard/TransportSingleShardAction.java
@@ -71,6 +71,8 @@
  * A base class for operations that need to perform a read operation on a single shard copy. If the operation fails,
  * the read operation can be performed on other shard copies. Concrete implementations can provide their own list
  * of candidate shards to try the read operation on.
+ *
+ * @opensearch.internal
  */
 public abstract class TransportSingleShardAction<Request extends SingleShardRequest<Request>, Response extends ActionResponse> extends
     TransportAction<Request, Response> {
diff --git a/server/src/main/java/org/opensearch/action/support/tasks/BaseTasksRequest.java b/server/src/main/java/org/opensearch/action/support/tasks/BaseTasksRequest.java
index bbe7b918b26a5..34a8412ea4129 100644
--- a/server/src/main/java/org/opensearch/action/support/tasks/BaseTasksRequest.java
+++ b/server/src/main/java/org/opensearch/action/support/tasks/BaseTasksRequest.java
@@ -49,6 +49,8 @@
 
 /**
  * A base class for task requests
+ *
+ * @opensearch.internal
  */
 public class BaseTasksRequest<Request extends BaseTasksRequest<Request>> extends ActionRequest {
 
diff --git a/server/src/main/java/org/opensearch/action/support/tasks/BaseTasksResponse.java b/server/src/main/java/org/opensearch/action/support/tasks/BaseTasksResponse.java
index 3ba32cf2a3b12..dce52d078ffe8 100644
--- a/server/src/main/java/org/opensearch/action/support/tasks/BaseTasksResponse.java
+++ b/server/src/main/java/org/opensearch/action/support/tasks/BaseTasksResponse.java
@@ -54,6 +54,8 @@
 
 /**
  * Base class for responses of task-related operations
+ *
+ * @opensearch.internal
  */
 public class BaseTasksResponse extends ActionResponse {
     protected static final String TASK_FAILURES = "task_failures";
diff --git a/server/src/main/java/org/opensearch/action/support/tasks/TasksRequestBuilder.java b/server/src/main/java/org/opensearch/action/support/tasks/TasksRequestBuilder.java
index 0dd0f585ae9e6..a15d008fea475 100644
--- a/server/src/main/java/org/opensearch/action/support/tasks/TasksRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/support/tasks/TasksRequestBuilder.java
@@ -39,6 +39,8 @@
 
 /**
  * Builder for task-based requests
+ *
+ * @opensearch.internal
  */
 public class TasksRequestBuilder<
     Request extends BaseTasksRequest<Request>,
diff --git a/server/src/main/java/org/opensearch/action/support/tasks/TransportTasksAction.java b/server/src/main/java/org/opensearch/action/support/tasks/TransportTasksAction.java
index 7bd5a8503b123..7a79d449538aa 100644
--- a/server/src/main/java/org/opensearch/action/support/tasks/TransportTasksAction.java
+++ b/server/src/main/java/org/opensearch/action/support/tasks/TransportTasksAction.java
@@ -73,6 +73,8 @@
 
 /**
  * The base class for transport actions that are interacting with currently running tasks.
+ *
+ * @opensearch.internal
  */
 public abstract class TransportTasksAction<
     OperationTask extends Task,
diff --git a/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsAction.java b/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsAction.java
index a14ae0ce94cc7..27d93f2a8e916 100644
--- a/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsAction.java
+++ b/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsAction.java
@@ -34,6 +34,11 @@
 
 import org.opensearch.action.ActionType;
 
+/**
+ * A single multi term action.
+ *
+ * @opensearch.internal
+ */
 public class MultiTermVectorsAction extends ActionType<MultiTermVectorsResponse> {
 
     public static final MultiTermVectorsAction INSTANCE = new MultiTermVectorsAction();
diff --git a/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsItemResponse.java b/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsItemResponse.java
index 037f4b95e3c73..0367c01d7e4b7 100644
--- a/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsItemResponse.java
+++ b/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsItemResponse.java
@@ -39,7 +39,9 @@
 import java.io.IOException;
 
 /**
- * A single multi get response.
+ * A single multi term response.
+ *
+ * @opensearch.internal
  */
 public class MultiTermVectorsItemResponse implements Writeable {
 
diff --git a/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsRequest.java b/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsRequest.java
index aada19b081a1c..b07472a1bb5d7 100644
--- a/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsRequest.java
+++ b/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsRequest.java
@@ -51,6 +51,11 @@
 import java.util.List;
 import java.util.Set;
 
+/**
+ * A single multi get request.
+ *
+ * @opensearch.internal
+ */
 public class MultiTermVectorsRequest extends ActionRequest
     implements
         Iterable<TermVectorsRequest>,
diff --git a/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsRequestBuilder.java b/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsRequestBuilder.java
index 51711c01beb44..04dfd39112d6e 100644
--- a/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsRequestBuilder.java
@@ -35,6 +35,11 @@
 import org.opensearch.action.ActionRequestBuilder;
 import org.opensearch.client.OpenSearchClient;
 
+/**
+ * A single multi get request builder.
+ *
+ * @opensearch.internal
+ */
 public class MultiTermVectorsRequestBuilder extends ActionRequestBuilder<MultiTermVectorsRequest, MultiTermVectorsResponse> {
 
     public MultiTermVectorsRequestBuilder(OpenSearchClient client, MultiTermVectorsAction action) {
diff --git a/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsResponse.java b/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsResponse.java
index 599c2fa883dc7..1dd4f524f86a2 100644
--- a/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsResponse.java
+++ b/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsResponse.java
@@ -45,6 +45,11 @@
 import java.util.Arrays;
 import java.util.Iterator;
 
+/**
+ * A multi get response.
+ *
+ * @opensearch.internal
+ */
 public class MultiTermVectorsResponse extends ActionResponse implements Iterable<MultiTermVectorsItemResponse>, ToXContentObject {
 
     /**
diff --git a/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsShardRequest.java b/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsShardRequest.java
index 85491b37b4914..d8c0c918cb821 100644
--- a/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsShardRequest.java
+++ b/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsShardRequest.java
@@ -42,6 +42,11 @@
 import java.util.ArrayList;
 import java.util.List;
 
+/**
+ * A multi get shard request.
+ *
+ * @opensearch.internal
+ */
 public class MultiTermVectorsShardRequest extends SingleShardRequest<MultiTermVectorsShardRequest> {
 
     private int shardId;
diff --git a/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsShardResponse.java b/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsShardResponse.java
index b01582230ed85..c819c591468ea 100644
--- a/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsShardResponse.java
+++ b/server/src/main/java/org/opensearch/action/termvectors/MultiTermVectorsShardResponse.java
@@ -41,6 +41,11 @@
 import java.util.ArrayList;
 import java.util.List;
 
+/**
+ * A multi get shard response.
+ *
+ * @opensearch.internal
+ */
 public class MultiTermVectorsShardResponse extends ActionResponse {
 
     final IntArrayList locations;
diff --git a/server/src/main/java/org/opensearch/action/termvectors/TermVectorsAction.java b/server/src/main/java/org/opensearch/action/termvectors/TermVectorsAction.java
index acdeb3d18c880..e810621b1a064 100644
--- a/server/src/main/java/org/opensearch/action/termvectors/TermVectorsAction.java
+++ b/server/src/main/java/org/opensearch/action/termvectors/TermVectorsAction.java
@@ -34,6 +34,12 @@
 
 import org.opensearch.action.ActionType;
 
+/**
+ * Transport action for returning the term vector (doc frequency, positions, offsets) for a
+ * document.
+ *
+ * @opensearch.internal
+ */
 public class TermVectorsAction extends ActionType<TermVectorsResponse> {
 
     public static final TermVectorsAction INSTANCE = new TermVectorsAction();
diff --git a/server/src/main/java/org/opensearch/action/termvectors/TermVectorsFields.java b/server/src/main/java/org/opensearch/action/termvectors/TermVectorsFields.java
index 0033e9299b76d..2349abcd5cbdc 100644
--- a/server/src/main/java/org/opensearch/action/termvectors/TermVectorsFields.java
+++ b/server/src/main/java/org/opensearch/action/termvectors/TermVectorsFields.java
@@ -130,8 +130,9 @@
  * <li>BytesRef: payload_freqency (if payloads)</li>
  * </ul></li>
  * </ul>
+ *
+ * @opensearch.internal
  */
-
 public final class TermVectorsFields extends Fields {
 
     private final ObjectLongHashMap<String> fieldMap;
diff --git a/server/src/main/java/org/opensearch/action/termvectors/TermVectorsFilter.java b/server/src/main/java/org/opensearch/action/termvectors/TermVectorsFilter.java
index 2d2650e2b9389..ea54cea675900 100644
--- a/server/src/main/java/org/opensearch/action/termvectors/TermVectorsFilter.java
+++ b/server/src/main/java/org/opensearch/action/termvectors/TermVectorsFilter.java
@@ -45,6 +45,12 @@
 import java.util.Map;
 import java.util.Set;
 
+/**
+ * Filter the term vector (doc frequency, positions, offsets) for a
+ * document.
+ *
+ * @opensearch.internal
+ */
 public class TermVectorsFilter {
     public static final int DEFAULT_MAX_QUERY_TERMS = 25;
     public static final int DEFAULT_MIN_TERM_FREQ = 0;
diff --git a/server/src/main/java/org/opensearch/action/termvectors/TermVectorsRequest.java b/server/src/main/java/org/opensearch/action/termvectors/TermVectorsRequest.java
index 214d5f0d6d4fa..7da1df1dbe308 100644
--- a/server/src/main/java/org/opensearch/action/termvectors/TermVectorsRequest.java
+++ b/server/src/main/java/org/opensearch/action/termvectors/TermVectorsRequest.java
@@ -73,6 +73,8 @@
  * <p>
  * Note, the {@link #index()}, and {@link #id(String)} are
  * required.
+ *
+ * @opensearch.internal
  */
 public class TermVectorsRequest extends SingleShardRequest<TermVectorsRequest> implements RealtimeRequest {
     private static final ParseField INDEX = new ParseField("_index");
diff --git a/server/src/main/java/org/opensearch/action/termvectors/TermVectorsRequestBuilder.java b/server/src/main/java/org/opensearch/action/termvectors/TermVectorsRequestBuilder.java
index 7294db072ad38..d9227a1afa199 100644
--- a/server/src/main/java/org/opensearch/action/termvectors/TermVectorsRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/termvectors/TermVectorsRequestBuilder.java
@@ -45,6 +45,8 @@
  * <p>
  * Note, the {@code index}, {@code type} and {@code id} are
  * required.
+ *
+ * @opensearch.internal
  */
 public class TermVectorsRequestBuilder extends ActionRequestBuilder<TermVectorsRequest, TermVectorsResponse> {
 
diff --git a/server/src/main/java/org/opensearch/action/termvectors/TermVectorsResponse.java b/server/src/main/java/org/opensearch/action/termvectors/TermVectorsResponse.java
index 870609d526909..80d80d01b9a93 100644
--- a/server/src/main/java/org/opensearch/action/termvectors/TermVectorsResponse.java
+++ b/server/src/main/java/org/opensearch/action/termvectors/TermVectorsResponse.java
@@ -58,6 +58,12 @@
 import java.util.Iterator;
 import java.util.Set;
 
+/**
+ * Response returning the term vector (doc frequency, positions, offsets) for a
+ * document.
+ *
+ * @opensearch.internal
+ */
 public class TermVectorsResponse extends ActionResponse implements ToXContentObject {
 
     private static class FieldStrings {
diff --git a/server/src/main/java/org/opensearch/action/termvectors/TermVectorsWriter.java b/server/src/main/java/org/opensearch/action/termvectors/TermVectorsWriter.java
index 2c1e543774da6..e7772cf300f5a 100644
--- a/server/src/main/java/org/opensearch/action/termvectors/TermVectorsWriter.java
+++ b/server/src/main/java/org/opensearch/action/termvectors/TermVectorsWriter.java
@@ -49,6 +49,12 @@
 import java.util.List;
 import java.util.Set;
 
+/**
+ * Writer for the term vector (doc frequency, positions, offsets) for a
+ * document.
+ *
+ * @opensearch.internal
+ */
 // package only - this is an internal class!
 final class TermVectorsWriter {
     final List<String> fields = new ArrayList<>();
diff --git a/server/src/main/java/org/opensearch/action/termvectors/TransportMultiTermVectorsAction.java b/server/src/main/java/org/opensearch/action/termvectors/TransportMultiTermVectorsAction.java
index 127b31f329d09..d90c3968bddbb 100644
--- a/server/src/main/java/org/opensearch/action/termvectors/TransportMultiTermVectorsAction.java
+++ b/server/src/main/java/org/opensearch/action/termvectors/TransportMultiTermVectorsAction.java
@@ -51,6 +51,11 @@
 import java.util.Map;
 import java.util.concurrent.atomic.AtomicInteger;
 
+/**
+ * Performs the multi term get operation.
+ *
+ * @opensearch.internal
+ */
 public class TransportMultiTermVectorsAction extends HandledTransportAction<MultiTermVectorsRequest, MultiTermVectorsResponse> {
 
     private final ClusterService clusterService;
diff --git a/server/src/main/java/org/opensearch/action/termvectors/TransportShardMultiTermsVectorAction.java b/server/src/main/java/org/opensearch/action/termvectors/TransportShardMultiTermsVectorAction.java
index 511b68965ebdf..b5928dc99571f 100644
--- a/server/src/main/java/org/opensearch/action/termvectors/TransportShardMultiTermsVectorAction.java
+++ b/server/src/main/java/org/opensearch/action/termvectors/TransportShardMultiTermsVectorAction.java
@@ -50,6 +50,11 @@
 import org.opensearch.threadpool.ThreadPool;
 import org.opensearch.transport.TransportService;
 
+/**
+ * Performs the multi term shard level get operation.
+ *
+ * @opensearch.internal
+ */
 public class TransportShardMultiTermsVectorAction extends TransportSingleShardAction<
     MultiTermVectorsShardRequest,
     MultiTermVectorsShardResponse> {
diff --git a/server/src/main/java/org/opensearch/action/termvectors/TransportTermVectorsAction.java b/server/src/main/java/org/opensearch/action/termvectors/TransportTermVectorsAction.java
index 3cfd9cf7da7c5..11770cd10d982 100644
--- a/server/src/main/java/org/opensearch/action/termvectors/TransportTermVectorsAction.java
+++ b/server/src/main/java/org/opensearch/action/termvectors/TransportTermVectorsAction.java
@@ -55,6 +55,8 @@
 
 /**
  * Performs the get operation.
+ *
+ * @opensearch.internal
  */
 public class TransportTermVectorsAction extends TransportSingleShardAction<TermVectorsRequest, TermVectorsResponse> {
 
diff --git a/server/src/main/java/org/opensearch/action/update/TransportUpdateAction.java b/server/src/main/java/org/opensearch/action/update/TransportUpdateAction.java
index 387c0d24ed4df..6de2748698bf1 100644
--- a/server/src/main/java/org/opensearch/action/update/TransportUpdateAction.java
+++ b/server/src/main/java/org/opensearch/action/update/TransportUpdateAction.java
@@ -81,6 +81,11 @@
 import static org.opensearch.action.bulk.TransportSingleItemBulkWriteAction.toSingleItemBulkRequest;
 import static org.opensearch.action.bulk.TransportSingleItemBulkWriteAction.wrapBulkResponse;
 
+/**
+ * Transport action for updating an index
+ *
+ * @opensearch.internal
+ */
 public class TransportUpdateAction extends TransportInstanceSingleOperationAction<UpdateRequest, UpdateResponse> {
 
     private final AutoCreateIndex autoCreateIndex;
diff --git a/server/src/main/java/org/opensearch/action/update/UpdateAction.java b/server/src/main/java/org/opensearch/action/update/UpdateAction.java
index c82cf96506de4..af520409f498c 100644
--- a/server/src/main/java/org/opensearch/action/update/UpdateAction.java
+++ b/server/src/main/java/org/opensearch/action/update/UpdateAction.java
@@ -34,6 +34,11 @@
 
 import org.opensearch.action.ActionType;
 
+/**
+ * Action for updating an index
+ *
+ * @opensearch.internal
+ */
 public class UpdateAction extends ActionType<UpdateResponse> {
 
     public static final UpdateAction INSTANCE = new UpdateAction();
diff --git a/server/src/main/java/org/opensearch/action/update/UpdateHelper.java b/server/src/main/java/org/opensearch/action/update/UpdateHelper.java
index 0da41a3028edf..7f4c9524d406d 100644
--- a/server/src/main/java/org/opensearch/action/update/UpdateHelper.java
+++ b/server/src/main/java/org/opensearch/action/update/UpdateHelper.java
@@ -67,6 +67,8 @@
 
 /**
  * Helper for translating an update request to an index, delete request or update response.
+ *
+ * @opensearch.internal
  */
 public class UpdateHelper {
 
diff --git a/server/src/main/java/org/opensearch/action/update/UpdateRequest.java b/server/src/main/java/org/opensearch/action/update/UpdateRequest.java
index 36be9f0160c9a..d434f134f4321 100644
--- a/server/src/main/java/org/opensearch/action/update/UpdateRequest.java
+++ b/server/src/main/java/org/opensearch/action/update/UpdateRequest.java
@@ -72,6 +72,11 @@
 import static org.opensearch.index.seqno.SequenceNumbers.UNASSIGNED_PRIMARY_TERM;
 import static org.opensearch.index.seqno.SequenceNumbers.UNASSIGNED_SEQ_NO;
 
+/**
+ * Transport request for updating an index
+ *
+ * @opensearch.internal
+ */
 public class UpdateRequest extends InstanceShardOperationRequest<UpdateRequest>
     implements
         DocWriteRequest<UpdateRequest>,
diff --git a/server/src/main/java/org/opensearch/action/update/UpdateRequestBuilder.java b/server/src/main/java/org/opensearch/action/update/UpdateRequestBuilder.java
index 73e470bf8ba69..e797c9857460c 100644
--- a/server/src/main/java/org/opensearch/action/update/UpdateRequestBuilder.java
+++ b/server/src/main/java/org/opensearch/action/update/UpdateRequestBuilder.java
@@ -46,6 +46,11 @@
 
 import java.util.Map;
 
+/**
+ * Transport request builder for updating an index
+ *
+ * @opensearch.internal
+ */
 public class UpdateRequestBuilder extends InstanceShardOperationRequestBuilder<UpdateRequest, UpdateResponse, UpdateRequestBuilder>
     implements
         WriteRequestBuilder<UpdateRequestBuilder> {
diff --git a/server/src/main/java/org/opensearch/action/update/UpdateResponse.java b/server/src/main/java/org/opensearch/action/update/UpdateResponse.java
index 2c6efaf3c5f6b..b51210d2d202b 100644
--- a/server/src/main/java/org/opensearch/action/update/UpdateResponse.java
+++ b/server/src/main/java/org/opensearch/action/update/UpdateResponse.java
@@ -45,6 +45,11 @@
 
 import static org.opensearch.common.xcontent.XContentParserUtils.ensureExpectedToken;
 
+/**
+ * Transport response for updating an index
+ *
+ * @opensearch.internal
+ */
 public class UpdateResponse extends DocWriteResponse {
 
     private static final String GET = "get";