cluster using elasticsearch

elastic.yml

elasticsearch_master:
    image: elasticsearch:latest
    command: "elasticsearch -Des.cluster.name=workagram -Des.node.master=true -Des.node.data=false"
    environment:
       - ES_JAVA_OPTS="-Xms512m -Xmx512m"
    ports:
      - "9200:9200"
      - "9300:9300"

elasticsearch1:
    image: elasticsearch:latest
    command: "elasticsearch -Des.cluster.name=workagram -Des.discovery.zen.ping.unicast.hosts=elasticsearch_master"
    links:
      - elasticsearch_master
    volumes:
      - "/opt/elasticsearch/data"
    environment:
       - ES_JAVA_OPTS="-Xms512m -Xmx512m"
elasticsearch2:
    image: elasticsearch:latest
    command: "elasticsearch -Des.cluster.name=workagram -Des.discovery.zen.ping.unicast.hosts=elasticsearch_master"
    links:
      - elasticsearch_master
    volumes:
      - "/opt/elasticsearch/data"
    environment:
       - ES_JAVA_OPTS="-Xms512m -Xmx512m"