@Override
    public void ping(ClusterMonitor<Node> clusterMonitor, Node node, Executor executor) {
        log.fine(() -> "Pinging " + node);
        Pinger pinger = pingFactory.createPinger(node, clusterMonitor, new PongCallback(node, clusterMonitor));
        pinger.ping();
    }
Used by the cluster monitor to manage node status
container-search/src/main/java/com/yahoo/search/dispatch/searchcluster/SearchCluster.java