code: @Override
      public RejectAssignmentResult rejectAssignment(RejectAssignmentRequest request) {
          request = beforeClientExecution(request);
          return executeRejectAssignment(request);
      }
docs: <p>
  The <code>RejectAssignment</code> operation rejects the results of a completed assignment.
  </p>
  <p>
  You can include an optional feedback message with the rejection, which the Worker can see in the Status section
  of the web site. When you include a feedback message with the rejection, it helps the Worker understand why the
  assignment was rejected, and can improve the quality of the results the Worker submits in the future.
  </p>
  <p>
  Only the Requester who created the HIT can reject an assignment for the HIT.
  </p>
  
  @param rejectAssignmentRequest
  @return Result of the RejectAssignment operation returned by the service.
  @throws ServiceException
  Amazon Mechanical Turk is temporarily unable to process your request. Try your call again.
  @throws RequestErrorException
  Your request is invalid.
  @sample AmazonMTurk.RejectAssignment
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/mturk-requester-2017-01-17/RejectAssignment"
  target="_top">AWS API Documentation</a>