@dadoonet I faced a scenario where we had incorrectly setup the firewall rules and a CLIENT node was able to join the cluster as it had access to the MASTER node but was not able to connect to one of the DATA nodes. This causes periodic exceptions to be logged when debug mode is enabled:
SendRequestTransportException[[es-2a][172.22.70.25:9300][cluster:monitor/nodes/info[n]]]; nested: NodeNotConnectedException[[es-2a][172.22.70.25:9300] Node not conn
ected];
I am not able to figure out why this action is invoked: cluster:monitor/nodes/info[n]?