Hi @chu_quang, and welcome to the forum!
AWS DocumentDB API is an emulation of MongoDB which differs in features, compatibility, and implementation from an actual MongoDB deployment. AWS DocumentDB suggestion of API version support (eg 3.6) is referring to the wire protocol used rather than the full MongoDB feature set for that version.
For further questions on AWS DocumentDB I’d suggest to contact AWS.
If you want to use the latest MongoDB features and drivers without emulation I’d strongly recommend to use MongoDB Atlas.
Regards,
Wan.