Intresting - insertOne added _id to the input data

[梵总]

https://jira.mongodb.org/browse/NODE-1160
before: storkeData = {a: 1, b: 2}

targetColl.insertOne(strokeData)

after: strokeData={a:1, b:2, _id: new ObjectId("639545affd84671b2a7f26ea")}

To avoid, we can add "forceServerObjectId", like:

targetColl.insertOne(strokeData, {forceServerObjectId: true})