diff --git a/server/src/main/java/org/opensearch/action/ActionModule.java b/server/src/main/java/org/opensearch/action/ActionModule.java
index 99147e213aad2..3f50b10518e38 100644
--- a/server/src/main/java/org/opensearch/action/ActionModule.java
+++ b/server/src/main/java/org/opensearch/action/ActionModule.java
@@ -284,7 +284,6 @@
 import org.opensearch.common.settings.ClusterSettings;
 import org.opensearch.extensions.ExtensionsManager;
 import org.opensearch.extensions.action.ExtensionAction;
-import org.opensearch.extensions.action.ExtensionProxyAction;
 import org.opensearch.extensions.action.ExtensionTransportAction;
 import org.opensearch.common.settings.IndexScopedSettings;
 import org.opensearch.common.settings.Settings;
@@ -718,13 +717,6 @@ public <Request extends ActionRequest, Response extends ActionResponse> void reg
         // Remote Store
         actions.register(RestoreRemoteStoreAction.INSTANCE, TransportRestoreRemoteStoreAction.class);
 
-        // TODO: Remove this and its tests, it is no longer used
-        // Need to migrate its NAME prefix to the dynamic action name
-        if (FeatureFlags.isEnabled(FeatureFlags.EXTENSIONS)) {
-            // ExtensionProxyAction
-            actions.register(ExtensionProxyAction.INSTANCE, ExtensionTransportAction.class);
-        }
-
         // Decommission actions
         actions.register(DecommissionAction.INSTANCE, TransportDecommissionAction.class);
         actions.register(GetDecommissionStateAction.INSTANCE, TransportGetDecommissionStateAction.class);
@@ -992,9 +984,9 @@ public RestController getRestController() {
      * @opensearch.internal
      */
     public static class DynamicActionRegistry {
-        // the immutable map of injected transport actions
+        // will be initialized with the immutable map of injected transport actions
         private Map<ActionType, TransportAction> actions = Collections.emptyMap();
-        // the dynamic map which can be updated over time
+        // the dynamic map which can be updated over time after initialization
         private final Map<ExtensionAction, ExtensionTransportAction> registry = new ConcurrentHashMap<>();
 
         private ActionFilters actionFilters;
@@ -1002,7 +994,7 @@ public static class DynamicActionRegistry {
         private TransportService transportService;
 
         /**
-         * Initialize the immutable actions in the registry.
+         * Initialize the immutable actions in the registry and provide parameters needed for dynamic actions.
          *
          * @param actions The injected map of {@link ActionType} to {@link TransportAction}
          * @param actionFilters The action filters
diff --git a/server/src/main/java/org/opensearch/extensions/action/ExtensionProxyAction.java b/server/src/main/java/org/opensearch/extensions/action/ExtensionProxyAction.java
deleted file mode 100644
index 7345cf44e007f..0000000000000
--- a/server/src/main/java/org/opensearch/extensions/action/ExtensionProxyAction.java
+++ /dev/null
@@ -1,25 +0,0 @@
-/*
- * SPDX-License-Identifier: Apache-2.0
- *
- * The OpenSearch Contributors require contributions made to
- * this file be licensed under the Apache-2.0 license or a
- * compatible open source license.
- */
-
-package org.opensearch.extensions.action;
-
-import org.opensearch.action.ActionType;
-
-/**
- * The main proxy action for all extensions
- *
- * @opensearch.internal
- */
-public class ExtensionProxyAction extends ActionType<ExtensionActionResponse> {
-    public static final String NAME = "cluster:internal/extensions";
-    public static final ExtensionProxyAction INSTANCE = new ExtensionProxyAction();
-
-    public ExtensionProxyAction() {
-        super(NAME, ExtensionActionResponse::new);
-    }
-}
diff --git a/server/src/test/java/org/opensearch/extensions/action/ExtensionProxyActionTests.java b/server/src/test/java/org/opensearch/extensions/action/ExtensionProxyActionTests.java
deleted file mode 100644
index 3719c29090287..0000000000000
--- a/server/src/test/java/org/opensearch/extensions/action/ExtensionProxyActionTests.java
+++ /dev/null
@@ -1,18 +0,0 @@
-/*
- * SPDX-License-Identifier: Apache-2.0
- *
- * The OpenSearch Contributors require contributions made to
- * this file be licensed under the Apache-2.0 license or a
- * compatible open source license.
- */
-
-package org.opensearch.extensions.action;
-
-import org.opensearch.test.OpenSearchTestCase;
-
-public class ExtensionProxyActionTests extends OpenSearchTestCase {
-    public void testExtensionProxyAction() {
-        assertEquals("cluster:internal/extensions", ExtensionProxyAction.NAME);
-        assertEquals(ExtensionProxyAction.class, ExtensionProxyAction.INSTANCE.getClass());
-    }
-}