code: @Override
      public AssociateTransitGatewayRouteTableResult associateTransitGatewayRouteTable(AssociateTransitGatewayRouteTableRequest request) {
          request = beforeClientExecution(request);
          return executeAssociateTransitGatewayRouteTable(request);
      }
docs: <p>
  Associates the specified attachment with the specified transit gateway route table. You can associate only one
  route table with an attachment.
  </p>
  
  @param associateTransitGatewayRouteTableRequest
  @return Result of the AssociateTransitGatewayRouteTable operation returned by the service.
  @sample AmazonEC2.AssociateTransitGatewayRouteTable
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/ec2-2016-11-15/AssociateTransitGatewayRouteTable"
  target="_top">AWS API Documentation</a>