A docker-compose file for spinning up a single node of Elasticsearch version locked at 6.2.4.

docker-compose-es-6.yml

version: "3.7"
services:
  elasticsearch:
    image: docker.elastic.co/elasticsearch/elasticsearch:6.2.4
    container_name: elasticsearch
    network_mode: host
    restart: always
    environment:
      - cluster.name=dev-elasticsearch
      - bootstrap.memory_lock=true
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    volumes:
      - esdata:/home/username/elasticsearch/data
    ports:
      - 9200:9200
volumes:
  esdata:
driver: local