code: @Override
      public DBCluster modifyDBCluster(ModifyDBClusterRequest request) {
          request = beforeClientExecution(request);
          return executeModifyDBCluster(request);
      }
docs: <p>
  Modify a setting for a DB cluster. You can change one or more database configuration parameters by specifying
  these parameters and the new values in the request.
  </p>
  
  @param modifyDBClusterRequest
  @return Result of the ModifyDBCluster 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.
  @throws StorageQuotaExceededException
  Request would result in user exceeding the allowed amount of storage available across all DB instances.
  @throws DBSubnetGroupNotFoundException
  <i>DBSubnetGroupName</i> does not refer to an existing DB subnet group.
  @throws InvalidVPCNetworkStateException
  DB subnet group does not cover all Availability Zones after it is created because users' change.
  @throws InvalidDBSubnetGroupStateException
  The DB subnet group cannot be deleted because it is in use.
  @throws InvalidSubnetException
  The requested subnet is invalid, or multiple subnets were requested that are not all in a common VPC.
  @throws DBClusterParameterGroupNotFoundException
  <i>DBClusterParameterGroupName</i> does not refer to an existing DB Cluster parameter group.
  @throws InvalidDBSecurityGroupStateException
  The state of the DB security group does not allow deletion.
  @throws InvalidDBInstanceStateException
  The specified DB instance is not in the <i>available</i> state.
  @throws DBClusterAlreadyExistsException
  User already has a DB cluster with the given identifier.
  @sample AmazonNeptune.ModifyDBCluster
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/neptune-2014-10-31/ModifyDBCluster" target="_top">AWS API
  Documentation</a>