Elasticsearch simple 3 node cluster on 3 machine with docker-compose

es-1-docker-compose.yml

version: "3.8"
services:
  es-1:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.8.0
    volumes:
      - ./elasticsearch.yml:/usr/share/elasticsearch/config/elasticsearch.yml
    ports:
      - "9200:9200"
      - "9300:9300"
    ulimits:
      memlock:
        soft: -1
        hard: -1

es-1-elasticsearch.yml

cluster.name: "docker-cluster"
network.host: 0.0.0.0

discovery.seed_hosts: "192.168.0.28,192.168.0.29"

node.name: "es-1"

network.publish_host: 192.168.0.27
cluster.initial_master_nodes: "es-1,es-2,es-3"

es-2-docker-compose.yml

version: "3.8"
services:
  es-2:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.8.0
    volumes:
      - ./elasticsearch.yml:/usr/share/elasticsearch/config/elasticsearch.yml
    ports:
      - "9200:9200"
      - "9300:9300"
    ulimits:
      memlock:
        soft: -1
        hard: -1

es-2-elasticsearch.yml

cluster.name: "docker-cluster"
network.host: 0.0.0.0

discovery.seed_hosts: "192.168.0.27,192.168.0.29"

node.name: "es-2"

network.publish_host: 192.168.0.28
cluster.initial_master_nodes: "es-1,es-2,es-3"

es-3-docker-compose.yml

version: "3.8"
services:
  es-3:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.8.0
    volumes:
      - ./elasticsearch.yml:/usr/share/elasticsearch/config/elasticsearch.yml
    ports:
      - "9200:9200"
      - "9300:9300"
    ulimits:
      memlock:
        soft: -1
        hard: -1

es-3-elasticsearch.yml

cluster.name: "docker-cluster"
network.host: 0.0.0.0

discovery.seed_hosts: "192.168.0.27,192.168.0.28"

node.name: "es-3"

network.publish_host: 192.168.0.29
cluster.initial_master_nodes: "es-1,es-2,es-3"