minimal elastic+kibana with docker-compose

docker-compose.yaml

version: '3.7'
services:
  elasticsearch:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.15.0
    environment:
      - "ES_JAVA_OPTS=-Xms256M -Xmx256M"
      - node.name=elasticsearch
      - cluster.name=docker-cluster
      - cluster.initial_master_nodes=elasticsearch
    ports:
      - 9200:9200
      - 9300:9300
  kibana:
    image: docker.elastic.co/kibana/kibana:7.15.0
    environment:
      SERVER_NAME: localhost
      ELASTICSEARCH_URL: http://elasticsearch:9200/
    ports:
      - 5601:5601