Hi
I notice that every "update" operation using the _id causes "11000:E11000 duplicate key error index" on the secondary log.

primary:

Tue Jul 24 09:45:17 [conn5] getmore local.oplog.rs query: { ts:

{ $gte: new Date(5766220961858716081) }

} cursorid:7344324393376596819 ntoreturn:0 keyUpdates:0 locks(micros) r:64 nreturned:1 reslen:146 0ms
Tue Jul 24 09:45:17 [conn2590] update r1.Attribute query:

{ _id: ObjectId('4ff62387e4b072a042eee906') }

update: { $set:

{ typeId: 1 }

} idhack:1 nmoved:1 nupdated:1 keyUpdates:0 locks(micros) w:385 0ms

secondary:

Tue Jul 24 09:45:17 [repl prefetch worker] User Assertion: 11000:E11000 duplicate key error index: r1.Attribute.$id dup key: { : ObjectId('4ff62387e4b072a042eee906') }