closeForumTopic(chatId, messageThreadId, form = {}) {
    form.chat_id = chatId;
    form.message_thread_id = messageThreadId;
    return this._request('closeForumTopic', { form });
  }
Use this method to close an open topic in a forum supergroup chat.
The bot must be an administrator in the chat for this to work and must have the can_manage_topics administrator rights, unless it is the creator of the topic.

@param {Number|String} chatId Unique identifier for the target group or username of the target supergroup (in the format @supergroupusername)
@param {Number} messageThreadId Unique identifier for the target message thread of the forum topic
@param {Object} [options] Additional Telegram query options
@return {Promise} True on success
@see https://core.telegram.org/bots/api#closeforumtopic