code: @Override
      public UntagLogGroupResult untagLogGroup(UntagLogGroupRequest request) {
          request = beforeClientExecution(request);
          return executeUntagLogGroup(request);
      }
docs: <p>
  Removes the specified tags from the specified log group.
  </p>
  <p>
  To list the tags for a log group, use <a>ListTagsLogGroup</a>. To add tags, use <a>UntagLogGroup</a>.
  </p>
  
  @param untagLogGroupRequest
  @return Result of the UntagLogGroup operation returned by the service.
  @throws ResourceNotFoundException
  The specified resource does not exist.
  @sample AWSLogs.UntagLogGroup
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/logs-2014-03-28/UntagLogGroup" target="_top">AWS API
  Documentation</a>