current Server Discovery and Monitoring engine is deprecated

[blanexie]

(node:23) DeprecationWarning: current Server Discovery and Monitoring engine is deprecated, and will be removed in a future version. To use the new Server Discover and Monitoring engine, pass option { useUnifiedTopology: true } to the MongoClient constructor.

mongdb 的错误, 解决办法: 可以参考 Automattic/mongoose#8362
和 https://blog.csdn.net/Mr_pets/article/details/102990293.

具体修改: 从抱错日志看需要修改 /app/exec.js:16:12 文件中的16行12列的连接mongodb连接代码,