code: @Override
      public EnableStageTransitionResult enableStageTransition(EnableStageTransitionRequest request) {
          request = beforeClientExecution(request);
          return executeEnableStageTransition(request);
      }
docs: <p>
  Enables artifacts in a pipeline to transition to a stage in a pipeline.
  </p>
  
  @param enableStageTransitionRequest
  Represents the input of an EnableStageTransition action.
  @return Result of the EnableStageTransition operation returned by the service.
  @throws ValidationException
  The validation was specified in an invalid format.
  @throws PipelineNotFoundException
  The specified pipeline was specified in an invalid format or cannot be found.
  @throws StageNotFoundException
  The specified stage was specified in an invalid format or cannot be found.
  @sample AWSCodePipeline.EnableStageTransition
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/codepipeline-2015-07-09/EnableStageTransition"
  target="_top">AWS API Documentation</a>