# Elasticsearch Cluster

## Config
- config/elasticsearch.yml

  - master
```
cluster.name: elasticsearch
node.master: true
node.data: false
network.host: 0.0.0.0
discovery.zen.ping.unicast.hosts: ["127.0.0.1", "52.78.139.201"]
```

  - data nodes
```
cluster.name: elasticsearch
node.master: false
node.data: true
network.host: 0.0.0.0
discovery.zen.ping.unicast.hosts: ["127.0.0.1", "52.78.207.130"]
```

- Security Group
  - **Don't use 0.0.0.0/32**
  - 9300
  - 9301


## Performance
- open files
`max file descriptors [4096] for elasticsearch process likely too low, consider increasing to at least [65536]`

## memory setting
```
ES_JAVA_OPTS="-Xms1536m -Xmx1536m" ./bin/elasticsearch
```