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I cannot connect to Elasticsearch docker server from my NodeJS application.

My code

This is my docker-compose file:

version: "3.7"
services:
  backend:
    container_name: vstay-api
    ports:
      - "4000:4000"
    build:
      context: .
      dockerfile: Dockerfile
    env_file:
      - ./.env
    environment:
      - DB_URI=mongodb://mongo:27017/vstay-db
      - DB_HOST=mongo
      - DB_PORT=27017
    restart: always
    links:
      - mongo
      - elasticsearch
  mongo:
    image: mongo:4.2
    ports:
      - "9000:27017"
    container_name: vstay-db
    restart: always
    volumes:
      - "./data/mongo:/data/db"
    environment:
      - DB_HOST=mongo
      - DB_PORT=27017
    command: mongod
  elasticsearch:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.9.3
    container_name: vstay_elasticsearch
    environment:
      - node.name=elasticsearch
      - cluster.name=datasearch …