我已经实现了一个带有多个服务器和数据库的微服务体系结构。我已经安装了elasticsearch与docker和当我做docker组成，一切似乎运行良好。
不过，我想将elasticsearch与系统中的几个数据库（下面这个示例中的mongodb）集成在一起。如何使用elasticsearch将两个mongodb同步到两个不同的容器中，以便搜索它们？

client:
  container_name: client
  stdin_open: true
  build:
    context: ./client
    dockerfile: Dockerfile
  restart: always
  volumes:
    - './client:/app'
  ports:
    - '1000:3000'
  environment:
    - NODE_ENV=development
    - CHOKIDAR_USEPOLLING=true

weatherdb:
  container_name: weather-db
  image: mongo
  restart: always
  ports:
    - '2002:27017'
  volumes:
    - ./weather_service/weather_db:/data/db
  networks:
    - backend

weather-service:
  container_name: weather-service
  build: ./weather_service
  restart: always
  ports:
    - "1002:3000"
  depends_on:
    - weatherdb
  links:
    - elasticsearch
  networks:
    - backend

newsdb:
  container_name: news-db
  image: mongo
  restart: always
  ports:
    - '2003:27017'
  volumes:
    - ./news_service/news_db:/data/db
  networks:
    - backend

news-service:
  container_name: news-service
  build: ./news_service
  restart: always
  ports:
    - "1003:3000"
  depends_on:
    - newsdb
  links:
    - elasticsearch
  networks:
    - backend

elasticsearch:
  image: docker.elastic.co/elasticsearch/elasticsearch:7.4.0
  container_name: elasticsearch
  restart: always
  ports:
    - 9200:9200
    - 9300:9300
  environment:
    ES_JAVA_OPTS: '-Xms512m -Xmx512m'
    network.bind_host: 0.0.0.0
    network.host: 0.0.0.0
    discovery.type: single-node
  volumes:
    -  ./elasticsearch/esdata:/usr/share/elasticsearch/data
  networks:
    - backend