code: public TopicInfo getInfo(String topicId, boolean sign) throws JinxException {
      JinxUtils.validateParams(topicId);
      Map<String, String> params = new TreeMap<>();
      params.put("method", "flickr.groups.discuss.topics.getInfo");
      params.put("topic_id", topicId);
      return jinx.flickrGet(params, TopicInfo.class, sign);
    }
docs: Get information about a group discussion topic.
  <br>
  This method does not require authentication. Unsigned requests can only see public topics.
  
  @param topicId (Required) The ID for the topic to get info for.
  @param sign    if true, the request will be signed.
  @return information about the topic.
  @throws JinxException if required parameters are missing, or if there are any errors.
  @see <a href="https://www.flickr.com/services/api/flickr.groups.discuss.topics.getInfo.html">flickr.groups.discuss.topics.getInfo</a>