[BWC and API enforcement] Introduce checks for enforcing the API rest…

…rictions (opensearch-project#11175)

Signed-off-by: Andriy Redko <andriy.redko@aiven.io>
Signed-off-by: Shivansh Arora <hishiv@amazon.com>

CHANGELOG.md

@@ -118,6 +118,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Make number of segment metadata files in remote segment store configurable ([#11329](https://github.com/opensearch-project/OpenSearch/pull/11329))
 - Allow changing number of replicas of searchable snapshot index ([#11317](https://github.com/opensearch-project/OpenSearch/pull/11317))
 - Adding slf4j license header to LoggerMessageFormat.java ([#11069](https://github.com/opensearch-project/OpenSearch/pull/11069))
+- [BWC and API enforcement] Introduce checks for enforcing the API restrictions ([#11175](https://github.com/opensearch-project/OpenSearch/pull/11175))
 
 ### Dependencies
 - Bump Lucene from 9.7.0 to 9.8.0 ([10276](https://github.com/opensearch-project/OpenSearch/pull/10276))

libs/common/src/main/java/org/opensearch/common/Nullable.java

@@ -32,6 +32,8 @@
 
 package org.opensearch.common;
 
+import org.opensearch.common.annotation.PublicApi;
+
 import javax.annotation.CheckForNull;
 import javax.annotation.meta.TypeQualifierNickname;
 
@@ -53,5 +55,6 @@
 @CheckForNull
 @Retention(RetentionPolicy.RUNTIME)
 @Target({ ElementType.PARAMETER, ElementType.FIELD, ElementType.METHOD })
+@PublicApi(since = "1.0.0")
 public @interface Nullable {
 }

libs/common/src/main/java/org/opensearch/common/SuppressForbidden.java

@@ -31,6 +31,8 @@
 
 package org.opensearch.common;
 
+import org.opensearch.common.annotation.PublicApi;
+
 import java.lang.annotation.ElementType;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
@@ -43,6 +45,7 @@
  */
 @Retention(RetentionPolicy.CLASS)
 @Target({ ElementType.CONSTRUCTOR, ElementType.FIELD, ElementType.METHOD, ElementType.TYPE })
+@PublicApi(since = "1.0.0")
 public @interface SuppressForbidden {
     String reason();
 }