code: @Override
      public DescribeChangeSetResult describeChangeSet(DescribeChangeSetRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeChangeSet(request);
      }
docs: <p>
  Returns the inputs for the change set and a list of changes that AWS CloudFormation will make if you execute the
  change set. For more information, see <a
  href="https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-changesets.html"
  >Updating Stacks Using Change Sets</a> in the AWS CloudFormation User Guide.
  </p>
  
  @param describeChangeSetRequest
  The input for the <a>DescribeChangeSet</a> action.
  @return Result of the DescribeChangeSet operation returned by the service.
  @throws ChangeSetNotFoundException
  The specified change set name or ID doesn't exit. To view valid change sets for a stack, use the
  <code>ListChangeSets</code> action.
  @sample AmazonCloudFormation.DescribeChangeSet
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/cloudformation-2010-05-15/DescribeChangeSet"
  target="_top">AWS API Documentation</a>