I've just set a relk stack with 3 master nodes, 2 data nodes, and 1 client node that talks to kibana. All 6 nodes are in the cluster. I read that my logstash instances need to talk to the data nodes directly. The stack is functioning but I'm curious what role the 3 masters are playing if I'm talking directly to the data nodes?
Also, should my ES cluster be behind a proxy?