code: @Override
      public DescribeClusterVersionsResult describeClusterVersions(DescribeClusterVersionsRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeClusterVersions(request);
      }
docs: <p>
  Returns descriptions of the available Amazon Redshift cluster versions. You can call this operation even before
  creating any clusters to learn more about the Amazon Redshift versions. For more information about managing
  clusters, go to <a href="https://docs.aws.amazon.com/redshift/latest/mgmt/working-with-clusters.html">Amazon
  Redshift Clusters</a> in the <i>Amazon Redshift Cluster Management Guide</i>.
  </p>
  
  @param describeClusterVersionsRequest
  @return Result of the DescribeClusterVersions operation returned by the service.
  @sample AmazonRedshift.DescribeClusterVersions
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/redshift-2012-12-01/DescribeClusterVersions"
  target="_top">AWS API Documentation</a>