Elasticsearch unreachable from service declared in docker-compose

[ray2 (ray)]

Hello everyone !

I have a problem to reach the Elasticsearch container from a service inside the docker network. So I'm running a single node instance and If I try to reach from localhost:9202 everything looks good but from the app service I get a connection refuse ConnectionError: connect ECONNREFUSED 192.168.176.3:9202. So the hostname es get resolved but I have no idea why it's refused. I have already spent time googling and make test but nothing. What is puzzling me is that I can reach the db service. Any idea ?

this is the docker-compose file

version: "3"

services:

  app:
    build: .
    command: sh -c "
      npm run migrate-db &&
      npm start"
    ports:
      - $APP_PORT:3000
    environment:
      - ES_HOST=es
      - DB_HOST=db
    env_file:
      - .env
    depends_on:
      - db
      - es

  db:
    image: "postgres:latest"
    volumes:
      - postgres-volume:/usr/share/postgresql/data
    ports:
      - $PG_PORT:5432
    env_file: 
      - .env

  es:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.15.2
    environment:
      - xpack.security.enabled=false
      - discovery.type=single-node
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
    ulimits:
      memlock:
        soft: -1
        hard: -1
      nofile:
        soft: 65536
        hard: 65536
    cap_add:
      - IPC_LOCK
    volumes:
      - elasticsearch-data:/usr/share/elasticsearch/data
    ports:
      - $ES_PORT:9200
      - 9300:9300

  kibana:
    image: docker.elastic.co/kibana/kibana:7.4.0
    environment:
      - ELASTICSEARCH_HOSTS=http://es:${ES_PORT}
    ports:
      - $KIBANA_PORT:5601
    depends_on:
      - es

volumes:
  postgres-volume:
    driver: local
  elasticsearch-data:
    driver: local

this is the JavaScript code in case you are wondering

const client = new Client({ node: `http://${env.ES_HOST}:${env.ES_PORT}` });