How should I set node master and node data?

Hello guys.
I’m new with Graylog.I’m building a ElasticSearch Cluster with 3 nodes.So how should I set the value of node.master and on 3 nodes for the better performance and HA.
Thanks you.

Hej @kieulam141,

if all ES servers are the same, use all with master and data - later if you see that the master.node tasks lower the performance you can add two little servers that take care of the master role.

Changing that later is no magic and can be done on the fly. (with on restart of elasticsearch)