@Override
      public RequestStatusResponse invoke() throws AmbariException {
        //return getManagementController().updateExtensions();
	    //TODO - do we need a separate method
        return getManagementController().updateStacks();
      }
The property ids for a Extension resource.
ambari-server/src/main/java/org/apache/ambari/server/controller/internal/ExtensionResourceProvider.java