findOneAndUpdate()` and `findOneAndDelete()` without the `useFindAndModify` option set to false are deprecated code example

Example: https://mongoosejs.com/docs/deprecations.html#findandmodify

// Make Mongoose use `findOneAndUpdate()`. Note that this option is `true`
// by default, you need to set it to false.
mongoose.set('useFindAndModify', false);