@Override
    public RequestStatus deleteResources(Request request, Predicate predicate)
        throws SystemException, UnsupportedPropertyException, NoSuchResourceException, NoSuchParentResourceException {
      return resourceProvider.deleteResources(request, predicate);
    }
@return the amended predicate, or {@code null} to use the provided one
ambari-server/src/main/java/org/apache/ambari/server/controller/internal/ClusterControllerImpl.java