private TubeMQResult handleCloneTopicRequest(String req) throws Exception {
        return nodeService.cloneTopicToBrokers(gson.fromJson(req, CloneTopicReq.class));
    }
Handles 'CLONE' method request.

@param req The JSON request
@return TubeMQResult based on the request
inlong-tubemq/tubemq-manager/src/main/java/org/apache/inlong/tubemq/manager/controller/topic/TopicWebController.java