Why mongoose 5.x is not compatible with 5.x mongodb server if mongoose is using compatible version of driver?

[MikeKoval]

Prerequisites

• I have written a descriptive issue title

Mongoose version

5.x.x

Node.js version

18.x

MongoDB version

5.x

Operating system

Linux

Operating system version (i.e. 20.04, 11.3, 10)

22

Issue

Hi! EoL of 4.4 mongo server is end of Feb.

Mongoose 5.x is using 3.7.4 mongodb driver
https://github.com/Automattic/mongoose/blob/5.x/package.json#L26
that is compatible with mongo server 5
https://www.mongodb.com/docs/drivers/node/current/compatibility/

App seems working fine also

why mongoose then states that 5.x mongoose is not compatible with mongo server 5 https://mongoosejs.com/docs/compatibility.html ?

Can you explain that statement and provide examples please and what risks we can have?

I know that the best option to update, we are in process, but not sure if can have that to the end of Feb when we have to switch to new mongo server version.

[heyfirst]

+1 I'd like to learn why it's not compatible with mongo server 5

[MikeKoval]

the first thing i noticed is db.collection.ensureIndex() that is removed https://www.mongodb.com/docs/manual/reference/method/db.collection.ensureIndex/ and can be handled via
mongoose.set('useCreateIndex', true);
but we dont use it at all.
are there any other reasons?

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[github-actions]

This issue was closed because it has been inactive for 19 days and has been marked as stale.