code: @Override
      public UntagRoleResult untagRole(UntagRoleRequest request) {
          request = beforeClientExecution(request);
          return executeUntagRole(request);
      }
docs: <p>
  Removes the specified tags from the role. For more information about tagging, see <a
  href="https://docs.aws.amazon.com/IAM/latest/UserGuide/id_tags.html">Tagging IAM Identities</a> in the <i>IAM
  User Guide</i>.
  </p>
  
  @param untagRoleRequest
  @return Result of the UntagRole operation returned by the service.
  @throws NoSuchEntityException
  The request was rejected because it referenced a resource entity that does not exist. The error message
  describes the resource.
  @throws ConcurrentModificationException
  The request was rejected because multiple requests to change this object were submitted simultaneously.
  Wait a few minutes and submit your request again.
  @throws ServiceFailureException
  The request processing has failed because of an unknown error, exception or failure.
  @sample AmazonIdentityManagement.UntagRole
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/iam-2010-05-08/UntagRole" target="_top">AWS API
  Documentation</a>