添加 Elasticsearch 迁移命令报错

我已经把 添加 Elasticsearch 迁移命令 的那段内容 保存到 deploy.php ，（见到报错后我检查过）。
然后执行 $ dep deploy
报下面的错：

✔ Executing task artisan:optimize
✔ Executing task artisan:migrate
➤ Executing task es:migrate
✔ Executing task deploy:failed
✔ Executing task deploy:unlock

In Client.php line 103:

  The command "/usr/bin/php /var/www/laravelShop-deployer/releases/2/artisan es:mi
  grate" failed.

  Exit Code: 1 (General error)

  Host Name: 我的公网 IP

  ================
    There are no commands defined in the "es" namespace.

    Did you mean this?
        session

        deploy [-p|--parallel] [-l|--limit LIMIT] [--no-hooks] [--log LOG] [--roles ROLES] [--hosts HOSTS] [-o|--option OPTION] [--] [<stage>]

➜  deploy-laravelShop git:(master) ✗

我又在一节课的最后一关被卡住了。