Remove duplicate documents in MongoDb?

Question

MongoDB

Faced such task: It is
necessary to remove duplicates in a collection provided that 'owner' == ''.

I use MongoDB and Mongoose.
How to delete these documents. The procedure will be repeated daily, records up to 20,000?

Answer 1

db.myCollection.find({}, {myCustomKey:1}).sort({_id:1}).forEach(function(doc){
    db.myCollection.remove({_id:{$gt:doc._id}, myCustomKey:doc.myCustomKey});
})

Answer 2

into the new one:
https://docs.mongodb.com/manual/reference/method/d...
and drop the old
one, or through an auxiliary collection