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[b1ron]

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1. MongoServerSelectionError - fixed by setting directConnection=true in MONGO_OPLOG_URL
2. MongoServerError (FieldPath field names may not start with '$') - fixed in Allow sorting by $natural FerretDB#3638
3. when the oplog is detected it will open a tailable cursor with awaitData true Support tailable cursors FerretDB#2283
4. it uses a deprecated command oplogReplay in conjunction with a filter on ts to replay oplog entries
5. seems to be optional Support maxTimeMS in getMore command parameter FerretDB#2984
6. FailedToParse -"find: unknown field "$clusterTime"" Parse the $clusterTime field FerretDB#3667

[b1ron]

re 4.

Deprecated

Changed in version 4.4.

Starting in MongoDB 4.4, the oplogReplay field is deprecated. find fields that use the $gte, $gt, or $eq filter predicated on the ts field will automatically utilize the storage format of the replica set's oplog to execute the command more efficiently. If specified, the server accepts the oplogReplay flag for backwards compatibility, but the flag has no effect.