code: @Override
      public DescribeEventSubscriptionsResult describeEventSubscriptions(DescribeEventSubscriptionsRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeEventSubscriptions(request);
      }
docs: <p>
  Lists all the subscription descriptions for a customer account. The description for a subscription includes
  SubscriptionName, SNSTopicARN, CustomerID, SourceType, SourceID, CreationTime, and Status.
  </p>
  <p>
  If you specify a SubscriptionName, lists the description for that subscription.
  </p>
  
  @param describeEventSubscriptionsRequest
  @return Result of the DescribeEventSubscriptions operation returned by the service.
  @throws SubscriptionNotFoundException
  @sample AmazonNeptune.DescribeEventSubscriptions
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/neptune-2014-10-31/DescribeEventSubscriptions"
  target="_top">AWS API Documentation</a>