code: @Override
      public DBCluster promoteReadReplicaDBCluster(PromoteReadReplicaDBClusterRequest request) {
          request = beforeClientExecution(request);
          return executePromoteReadReplicaDBCluster(request);
      }
docs: <p>
  Promotes a Read Replica DB cluster to a standalone DB cluster.
  </p>
  
  @param promoteReadReplicaDBClusterRequest
  @return Result of the PromoteReadReplicaDBCluster operation returned by the service.
  @throws DBClusterNotFoundException
  <i>DBClusterIdentifier</i> does not refer to an existing DB cluster.
  @throws InvalidDBClusterStateException
  The DB cluster is not in a valid state.
  @sample AmazonNeptune.PromoteReadReplicaDBCluster
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/neptune-2014-10-31/PromoteReadReplicaDBCluster"
  target="_top">AWS API Documentation</a>