code: @Override
      public RemoveRoleFromDBClusterResult removeRoleFromDBCluster(RemoveRoleFromDBClusterRequest request) {
          request = beforeClientExecution(request);
          return executeRemoveRoleFromDBCluster(request);
      }
docs: <p>
  Disassociates an Identity and Access Management (IAM) role from a DB cluster.
  </p>
  
  @param removeRoleFromDBClusterRequest
  @return Result of the RemoveRoleFromDBCluster operation returned by the service.
  @throws DBClusterNotFoundException
  <i>DBClusterIdentifier</i> does not refer to an existing DB cluster.
  @throws DBClusterRoleNotFoundException
  The specified IAM role Amazon Resource Name (ARN) is not associated with the specified DB cluster.
  @throws InvalidDBClusterStateException
  The DB cluster is not in a valid state.
  @sample AmazonNeptune.RemoveRoleFromDBCluster
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/neptune-2014-10-31/RemoveRoleFromDBCluster"
  target="_top">AWS API Documentation</a>