No recordId
What changes in No recordId compared with MongoDB and what your application has to do.
This difference is of the Different kind.
What MongoDB does
$meta: "recordId" and showRecordId give the record identifier of the storage engine.
What TeselaDB does
They give no value: the field does not appear. $meta: "indexKey" works as in MongoDB.
What your application has to do
Do not use the record identifier; use _id or your own key.