code: @Override
      public EventSubscription deleteEventSubscription(DeleteEventSubscriptionRequest request) {
          request = beforeClientExecution(request);
          return executeDeleteEventSubscription(request);
      }
docs: <p>
  Deletes an event notification subscription.
  </p>
  
  @param deleteEventSubscriptionRequest
  @return Result of the DeleteEventSubscription operation returned by the service.
  @throws SubscriptionNotFoundException
  @throws InvalidEventSubscriptionStateException
  @sample AmazonNeptune.DeleteEventSubscription
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/neptune-2014-10-31/DeleteEventSubscription"
  target="_top">AWS API Documentation</a>