code: @Override
      public DeregisterEventTopicResult deregisterEventTopic(DeregisterEventTopicRequest request) {
          request = beforeClientExecution(request);
          return executeDeregisterEventTopic(request);
      }
docs: <p>
  Removes the specified directory as a publisher to the specified SNS topic.
  </p>
  
  @param deregisterEventTopicRequest
  Removes the specified directory as a publisher to the specified SNS topic.
  @return Result of the DeregisterEventTopic operation returned by the service.
  @throws EntityDoesNotExistException
  The specified entity could not be found.
  @throws InvalidParameterException
  One or more parameters are not valid.
  @throws ClientException
  A client exception has occurred.
  @throws ServiceException
  An exception has occurred in AWS Directory Service.
  @sample AWSDirectoryService.DeregisterEventTopic
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/ds-2015-04-16/DeregisterEventTopic" target="_top">AWS API
  Documentation</a>