code: @Override
      public DescribeApplicationVersionsResult describeApplicationVersions(DescribeApplicationVersionsRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeApplicationVersions(request);
      }
docs: <p>
  Retrieve a list of application versions.
  </p>
  
  @param describeApplicationVersionsRequest
  Request to describe application versions.
  @return Result of the DescribeApplicationVersions operation returned by the service.
  @sample AWSElasticBeanstalk.DescribeApplicationVersions
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/elasticbeanstalk-2010-12-01/DescribeApplicationVersions"
  target="_top">AWS API Documentation</a>