Scaling Elasticsearch

For production, you need at least 3 master-eligible nodes.

Configuration (`elasticsearch.yml`)

On Node 1:

cluster.name: my-cluster
node.name: node-1
network.host: 0.0.0.0
discovery.seed_hosts: ["192.168.0.1", "192.168.0.2", "192.168.0.3"]
cluster.initial_master_nodes: ["node-1", "node-2", "node-3"]

Repeat for Node 2 and 3, changing `node.name` and `network.host`.

JVM Heap

Set `ES_JAVA_OPTS` to 50% of available RAM, but no more than 31GB.