具有部署副本的一项服务与用于docker swarm中弹性的单独服务

Question

有两种方法可以在docker swarm中部署弹性集群

1）一种带有副本的docker服务，如此处http://derpturkey.com/elasticsearch-cluster-with-docker-engine-swarm-mode/所述，它具有dns循环轮询

version: '3.5'
services:
   elastic-2:
      image:elasticsearch:7.4.2
      deploy:
         replicas: 3
      ...

2）此处https://www.elastic.co/guide/en/elasticsearch/reference/current/docker.html

所述的独立服务

version: '3.5'
services:
  elastic-1:
    image: elasticsearch:7.4.2
    environment:
      - node.name=elastic-1
      - discovery.seed_hosts=elastic-1,elastic-3,elastic-2
      - cluster.initial_master_nodes=elastic-1
      - cluster.name=docker-cluster
      - "ES_JAVA_OPTS=-Xms2048m -Xmx2048m"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    volumes:
      - esdata:/usr/share/elasticsearch/data
    deploy:
      placement:
        constraints:
          - node.hostname==barn-1
      resources:
        limits:
           memory: 8000M
    sysctls:
      - vm.max_map_count=262144

  elastic-2:
     ...

  elastic-3:
     ...

我应将其中哪些用于elasticsearch：7.X？他们每个人都有哪些利弊？