code: @Override
      public StopExecutionResult stopExecution(StopExecutionRequest request) {
          request = beforeClientExecution(request);
          return executeStopExecution(request);
      }
docs: <p>
  Stops an execution.
  </p>
  
  @param stopExecutionRequest
  @return Result of the StopExecution operation returned by the service.
  @throws ExecutionDoesNotExistException
  The specified execution does not exist.
  @throws InvalidArnException
  The provided Amazon Resource Name (ARN) is invalid.
  @sample AWSStepFunctions.StopExecution
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/states-2016-11-23/StopExecution" target="_top">AWS API
  Documentation</a>