[Backport 2.x] Fixing issues when deserializing response for tasks API

CHANGELOG.md

@@ -18,6 +18,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ### Fixed
 - Fix missing Highlight and SourceConfig in the MultisearchBody ([#442](https://github.com/opensearch-project/opensearch-java/pull/442))
 - Fix search failure with missing required property HitsMetadata.total when trackTotalHits is disabled ([#372](https://github.com/opensearch-project/opensearch-java/pull/372))
+- Fix failure when deserialing response for tasks API ([#463](https://github.com/opensearch-project/opensearch-java/pull/463))
 
 ### Security
 

java-client/src/main/java/org/opensearch/client/opensearch/_types/BaseNode.java

@@ -67,38 +67,38 @@ public abstract class BaseNode implements JsonpSerializable {
 
 	protected BaseNode(AbstractBuilder<?> builder) {
 
-		this.attributes = ApiTypeHelper.unmodifiableRequired(builder.attributes, this, "attributes");
-		this.host = ApiTypeHelper.requireNonNull(builder.host, this, "host");
-		this.ip = ApiTypeHelper.requireNonNull(builder.ip, this, "ip");
-		this.name = ApiTypeHelper.requireNonNull(builder.name, this, "name");
+		this.attributes = ApiTypeHelper.unmodifiable(builder.attributes);
+		this.host = builder.host;
+		this.ip = builder.ip;
+		this.name = builder.name;
 		this.roles = ApiTypeHelper.unmodifiable(builder.roles);
-		this.transportAddress = ApiTypeHelper.requireNonNull(builder.transportAddress, this, "transportAddress");
+		this.transportAddress = builder.transportAddress;
 
 	}
 
 	/**
-	 * Required - API name: {@code attributes}
+	 * API name: {@code attributes}
 	 */
 	public final Map<String, String> attributes() {
 		return this.attributes;
 	}
 
 	/**
-	 * Required - API name: {@code host}
+	 * API name: {@code host}
 	 */
 	public final String host() {
 		return this.host;
 	}
 
 	/**
-	 * Required - API name: {@code ip}
+	 * API name: {@code ip}
 	 */
 	public final String ip() {
 		return this.ip;
 	}
 
 	/**
-	 * Required - API name: {@code name}
+	 * API name: {@code name}
 	 */
 	public final String name() {
 		return this.name;
@@ -112,7 +112,7 @@ public final List<NodeRole> roles() {
 	}
 
 	/**
-	 * Required - API name: {@code transport_address}
+	 * API name: {@code transport_address}
 	 */
 	public final String transportAddress() {
 		return this.transportAddress;
@@ -166,21 +166,26 @@ protected void serializeInternal(JsonGenerator generator, JsonpMapper mapper) {
 	protected abstract static class AbstractBuilder<BuilderT extends AbstractBuilder<BuilderT>>
 			extends
 				ObjectBuilderBase {
+		@Nullable			
 		private Map<String, String> attributes;
 
+		@Nullable
 		private String host;
 
+		@Nullable
 		private String ip;
 
+		@Nullable
 		private String name;
 
 		@Nullable
 		private List<NodeRole> roles;
 
+		@Nullable
 		private String transportAddress;
 
 		/**
-		 * Required - API name: {@code attributes}
+		 * API name: {@code attributes}
 		 * <p>
 		 * Adds all entries of <code>map</code> to <code>attributes</code>.
 		 */
@@ -190,7 +195,7 @@ public final BuilderT attributes(Map<String, String> map) {
 		}
 
 		/**
-		 * Required - API name: {@code attributes}
+		 * API name: {@code attributes}
 		 * <p>
 		 * Adds an entry to <code>attributes</code>.
 		 */
@@ -200,23 +205,23 @@ public final BuilderT attributes(String key, String value) {
 		}
 
 		/**
-		 * Required - API name: {@code host}
+		 * API name: {@code host}
 		 */
 		public final BuilderT host(String value) {
 			this.host = value;
 			return self();
 		}
 
 		/**
-		 * Required - API name: {@code ip}
+		 * API name: {@code ip}
 		 */
 		public final BuilderT ip(String value) {
 			this.ip = value;
 			return self();
 		}
 
 		/**
-		 * Required - API name: {@code name}
+		 * API name: {@code name}
 		 */
 		public final BuilderT name(String value) {
 			this.name = value;
@@ -244,7 +249,7 @@ public final BuilderT roles(NodeRole value, NodeRole... values) {
 		}
 
 		/**
-		 * Required - API name: {@code transport_address}
+		 * API name: {@code transport_address}
 		 */
 		public final BuilderT transportAddress(String value) {
 			this.transportAddress = value;

java-client/src/test/java/org/opensearch/client/opensearch/integTest/AbstractNodesIT.java

@@ -13,13 +13,22 @@
 import static org.hamcrest.Matchers.anEmptyMap;
 
 import java.io.IOException;
+import java.util.Arrays;
 
 import org.opensearch.client.opensearch.nodes.NodesStatsResponse;
+import org.opensearch.client.opensearch.tasks.ListRequest;
+import org.opensearch.client.opensearch.tasks.ListResponse;
 
 public abstract class AbstractNodesIT extends OpenSearchJavaClientTestCase {
     public void testNodesStats() throws IOException {
         final NodesStatsResponse response = javaClient().nodes().stats();
         assertThat(response.clusterName(), not(nullValue()));
         assertThat(response.nodes(), not(anEmptyMap()));
     }
+
+    public void testNodesList() throws IOException {
+        ListRequest listRequest = new ListRequest.Builder().actions(Arrays.asList("*reindex")).build();
+        ListResponse listResponse = javaClient().tasks().list();
+        assertThat(listResponse.nodes(), not(anEmptyMap()));
+    }
 }