Added javadocs for extensibility

server/src/main/java/org/opensearch/discovery/PluginRequest.java

@@ -18,6 +18,11 @@
 import java.util.List;
 import java.util.Objects;
 
+/**
+ * PluginRequest to intialize plugin
+ *
+ * @opensearch.internal
+ */
 public class PluginRequest extends TransportRequest {
     private final DiscoveryNode sourceNode;
     /*

server/src/main/java/org/opensearch/discovery/PluginResponse.java

@@ -39,6 +39,11 @@
 import java.io.IOException;
 import java.util.Objects;
 
+/**
+ * PluginResponse to intialize plugin
+ *
+ * @opensearch.internal
+ */
 public class PluginResponse extends TransportResponse {
     private String name;
 

server/src/main/java/org/opensearch/extensions/DiscoveryExtension.java

@@ -22,6 +22,11 @@
 import java.io.IOException;
 import java.util.Map;
 
+/**
+ * Discover extensions running independently or in a separate process
+ *
+ * @opensearch.internal
+ */
 public class DiscoveryExtension extends DiscoveryNode implements Writeable, ToXContentFragment {
 
     private final PluginInfo pluginInfo;

server/src/main/java/org/opensearch/extensions/ExtensionsOrchestrator.java

@@ -44,6 +44,11 @@
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 
+/**
+ * The main class for Plugin Extensibility
+ *
+ * @opensearch.internal
+ */
 public class ExtensionsOrchestrator implements ReportingService<PluginsAndModules> {
     public static final String REQUEST_EXTENSION_ACTION_NAME = "internal:discovery/extensions";
     public static final String INDICES_EXTENSION_POINT_ACTION_NAME = "indices:internal/extensions";

server/src/main/java/org/opensearch/index/IndicesModuleNameResponse.java

@@ -14,6 +14,11 @@
 
 import java.io.IOException;
 
+/**
+ * Response for index name of onIndexModule extension point
+ *
+ * @opensearch.internal
+ */
 public class IndicesModuleNameResponse extends TransportResponse {
     private boolean requestAck;
 

server/src/main/java/org/opensearch/index/IndicesModuleRequest.java

@@ -16,6 +16,11 @@
 import java.io.IOException;
 import java.util.Objects;
 
+/**
+ * Request for onIndexModule extension point
+ *
+ * @opensearch.internal
+ */
 public class IndicesModuleRequest extends TransportRequest {
     private final Index index;
     private final Settings indexSettings;

server/src/main/java/org/opensearch/index/IndicesModuleResponse.java

@@ -15,6 +15,11 @@
 import java.io.IOException;
 import java.util.Objects;
 
+/**
+ * Response for onIndexModule extension point
+ *
+ * @opensearch.internal
+ */
 public class IndicesModuleResponse extends TransportResponse {
     private boolean addIndexEventListener;
     private boolean addIndexOperationListener;