code: @Override
      public StopStackSetOperationResult stopStackSetOperation(StopStackSetOperationRequest request) {
          request = beforeClientExecution(request);
          return executeStopStackSetOperation(request);
      }
docs: <p>
  Stops an in-progress operation on a stack set and its associated stack instances.
  </p>
  
  @param stopStackSetOperationRequest
  @return Result of the StopStackSetOperation operation returned by the service.
  @throws StackSetNotFoundException
  The specified stack set doesn't exist.
  @throws OperationNotFoundException
  The specified ID refers to an operation that doesn't exist.
  @throws InvalidOperationException
  The specified operation isn't valid.
  @sample AmazonCloudFormation.StopStackSetOperation
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/cloudformation-2010-05-15/StopStackSetOperation"
  target="_top">AWS API Documentation</a>