[2.x] Updating ReplicationPluginInterface from open class to object

src/main/kotlin/org/opensearch/commons/replication/ReplicationPluginInterface.kt

@@ -17,16 +17,15 @@ import org.opensearch.core.common.io.stream.Writeable
 /**
  * Transport action plugin interfaces for the cross-cluster-replication plugin.
  */
-open class ReplicationPluginInterface {
-
+object ReplicationPluginInterface {
     /**
      * Stop replication.
      * @param client Node client for making transport action
      * @param request The request object
      * @param listener The listener for getting response
      */
 
-    open fun stopReplication(
+    fun stopReplication(
         client: Client,
         request: StopIndexReplicationRequest,
         listener: ActionListener<AcknowledgedResponse>

src/test/kotlin/org/opensearch/commons/replication/ReplicationPluginInterfaceTests.kt

@@ -36,9 +36,8 @@ internal class ReplicationPluginInterfaceTests {
                 actionListener.onResponse(acknowledgedResponse) // Simulate success
             }
 
-        val replicationPluginInterface = ReplicationPluginInterface()
         // Call method under test
-        replicationPluginInterface.stopReplication(client, request, listener)
+        ReplicationPluginInterface.stopReplication(client, request, listener)
         // Verify that listener.onResponse is called with the correct response
         verify(listener).onResponse(acknowledgedResponse)
     }
@@ -58,9 +57,8 @@ internal class ReplicationPluginInterfaceTests {
                 actionListener.onFailure(exception) // Simulate failure
             }
 
-        val replicationPluginInterface = ReplicationPluginInterface()
         // Call method under test
-        replicationPluginInterface.stopReplication(client, request, listener)
+        ReplicationPluginInterface.stopReplication(client, request, listener)
         // Verify that listener.onResponse is called with the correct response
         verify(listener).onFailure(exception)
     }