Docker compose Spring Boot MongoDB

docker-compose.yml

#version: "3.7"
#services:
#  api_service:
#    build: .
#    restart: always
#    ports:
#      - 8080:8080
#    links:
#      - mongo_db:app_db
#  mongo_db:
#    image: "mongo:4.4.3"
#    restart: always
#    ports:
#      - 27017:27017

version: "3.7"
services:
  api_service:
    build: .
    restart: always
    ports:
      - 8080:8080
    depends_on:
      - mongo_db
  mongo_db:
    image: "mongo:4.4.3"
    restart: always
    ports:
      - 27017:27017