code: @Override
      public ContinueUpdateRollbackResult continueUpdateRollback(ContinueUpdateRollbackRequest request) {
          request = beforeClientExecution(request);
          return executeContinueUpdateRollback(request);
      }
docs: <p>
  For a specified stack that is in the <code>UPDATE_ROLLBACK_FAILED</code> state, continues rolling it back to the
  <code>UPDATE_ROLLBACK_COMPLETE</code> state. Depending on the cause of the failure, you can manually <a href=
  "https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/troubleshooting.html#troubleshooting-errors-update-rollback-failed"
  > fix the error</a> and continue the rollback. By continuing the rollback, you can return your stack to a working
  state (the <code>UPDATE_ROLLBACK_COMPLETE</code> state), and then try to update the stack again.
  </p>
  <p>
  A stack goes into the <code>UPDATE_ROLLBACK_FAILED</code> state when AWS CloudFormation cannot roll back all
  changes after a failed stack update. For example, you might have a stack that is rolling back to an old database
  instance that was deleted outside of AWS CloudFormation. Because AWS CloudFormation doesn't know the database was
  deleted, it assumes that the database instance still exists and attempts to roll back to it, causing the update
  rollback to fail.
  </p>
  
  @param continueUpdateRollbackRequest
  The input for the <a>ContinueUpdateRollback</a> action.
  @return Result of the ContinueUpdateRollback operation returned by the service.
  @throws TokenAlreadyExistsException
  A client request token already exists.
  @sample AmazonCloudFormation.ContinueUpdateRollback
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/cloudformation-2010-05-15/ContinueUpdateRollback"
  target="_top">AWS API Documentation</a>