code: @Override
      public StartNextPendingJobExecutionResult startNextPendingJobExecution(StartNextPendingJobExecutionRequest request) {
          request = beforeClientExecution(request);
          return executeStartNextPendingJobExecution(request);
      }
docs: <p>
  Gets and starts the next pending (status IN_PROGRESS or QUEUED) job execution for a thing.
  </p>
  
  @param startNextPendingJobExecutionRequest
  @return Result of the StartNextPendingJobExecution operation returned by the service.
  @throws InvalidRequestException
  The contents of the request were invalid. For example, this code is returned when an UpdateJobExecution
  request contains invalid status details. The message contains details about the error.
  @throws ResourceNotFoundException
  The specified resource does not exist.
  @throws ThrottlingException
  The rate exceeds the limit.
  @throws ServiceUnavailableException
  The service is temporarily unavailable.
  @throws CertificateValidationException
  The certificate is invalid.
  @sample AWSIoTJobsDataPlane.StartNextPendingJobExecution
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/iot-jobs-data-2017-09-29/StartNextPendingJobExecution"
  target="_top">AWS API Documentation</a>