docs: public static ClusteringService startForked( Channel mainChannel ) {
          if (!mainChannel.isConnected()) {
              throw new IllegalStateException(ClusteringI18n.channelNotConnected.text());                        
          }
          ClusteringService clusteringService = new ForkedClusteringService(mainChannel);
          clusteringService.init();
          return clusteringService;
      }