Multiple nodes of ElasticSearch

Hi there,

I am trying to find out, what license I need to implement multiple nodes of elasticsearch
and example I have 3 nodes those that means I have 1 primary nodes and 2 secondary nodes,
and the secondary nodes stands as a load balancer ?

thank you,

There are no license restrictions for clustering (that I'm aware of).

Also, Elasticsearch is a bit different from some other DBs (like MSSQL), there are no primary/secondary's, all nodes are for the most part equal. Node | Elasticsearch Guide [7.13] | Elastic explains the node roles better.