9.0.2 how to enable "Elasticsearch"

Is it possible to enable Elasticsearch on a working installation running as docker ?
If so, how?

that’s my docker-compose.yml

version: '2.0'
services:
  db:
    image: mariadb:10.1
    container_name: seafile-mysql
    environment:
      - MYSQL_ROOT_PASSWORD=____________  # Requested, set the root's password of MySQL service.
      - MYSQL_LOG_CONSOLE=true
    volumes:
      - /opt/seafile-mysql/db:/var/lib/mysql  # Requested, specifies the path to MySQL data persistent store.
    networks:
      - seafile-net

  memcached:
    image: memcached:1.5.6
    container_name: seafile-memcached
    entrypoint: memcached -m 256
    networks:
      - seafile-net

  seafile:
    image: seafileltd/seafile-mc:9.0.2
    container_name: seafile
    ports:
      - "80:80"
      - "443:443"  # If https is enabled, cancel the comment.
    volumes:
      - /mnt/d1/opt/seafile-data:/shared   # Requested, specifies the path to Seafile data persistent store.
    environment:
      - DB_HOST=db
      - DB_ROOT_PASSWD=____________  # Requested, the value shuold be root's password of MySQL service.
      - TIME_ZONE=Etc/UTC  # Optional, default is UTC. Should be uncomment and set to your local time zone.
      - SEAFILE_ADMIN_EMAIL=____________@gmail.com # Specifies Seafile admin user, default is 'me@example.com'.
      - SEAFILE_ADMIN_PASSWORD=____________     # Specifies Seafile admin password, default is 'asecret'.
      - SEAFILE_SERVER_LETSENCRYPT=true   # Whether to use https or not.
      - SEAFILE_SERVER_HOSTNAME=cloud.____________.com # Specifies your host name if https is enabled.
    depends_on:
      - db
      - memcached
    networks:
      - seafile-net

networks:
  seafile-net:

The search feature is only part of the professional edition.