code: @Override
      public EventSubscription removeSourceIdentifierFromSubscription(RemoveSourceIdentifierFromSubscriptionRequest request) {
          request = beforeClientExecution(request);
          return executeRemoveSourceIdentifierFromSubscription(request);
      }
docs: <p>
  Removes a source identifier from an existing event notification subscription.
  </p>
  
  @param removeSourceIdentifierFromSubscriptionRequest
  @return Result of the RemoveSourceIdentifierFromSubscription operation returned by the service.
  @throws SubscriptionNotFoundException
  @throws SourceNotFoundException
  @sample AmazonNeptune.RemoveSourceIdentifierFromSubscription
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/neptune-2014-10-31/RemoveSourceIdentifierFromSubscription"
  target="_top">AWS API Documentation</a>