elasticsearch 6.6.* simple compose with volume

elasticsearch-6.6.*-simple-compose-volume.yaml

version: '3.3'
services:
  elasticsearch:
    image: docker.elastic.co/elasticsearch/elasticsearch:6.6.0
    container_name: elasticsearch
    volumes:
      - /var/db/data/elasticsearch:/usr/share/elasticsearch
    ports:
      - 9200:9200
      - 9300:9300
    environment:
      ES_JAVA_OPTS: '-Xms256m -Xmx256m'
      network.bind_host: 0.0.0.0
      network.host: 0.0.0.0
      discovery.type: single-node