code: @Override
      public DeleteDBClusterParameterGroupResult deleteDBClusterParameterGroup(DeleteDBClusterParameterGroupRequest request) {
          request = beforeClientExecution(request);
          return executeDeleteDBClusterParameterGroup(request);
      }
docs: <p>
  Deletes a specified DB cluster parameter group. The DB cluster parameter group to be deleted can't be associated
  with any DB clusters.
  </p>
  
  @param deleteDBClusterParameterGroupRequest
  @return Result of the DeleteDBClusterParameterGroup operation returned by the service.
  @throws InvalidDBParameterGroupStateException
  The DB parameter group is in use or is in an invalid state. If you are attempting to delete the parameter
  group, you cannot delete it when the parameter group is in this state.
  @throws DBParameterGroupNotFoundException
  <i>DBParameterGroupName</i> does not refer to an existing DB parameter group.
  @sample AmazonNeptune.DeleteDBClusterParameterGroup
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/neptune-2014-10-31/DeleteDBClusterParameterGroup"
  target="_top">AWS API Documentation</a>