Currently, if you set a subscription on a link in flexible sync, the following query will look like the following:

```
NET Code:
var newQuery = realm.All<AllPrimitiveTypes>().Where(o => o.LinkingObjectField == linkingObject);

RQL sent to server
(LinkingObjectField == O0)
```

This is the internal realm object key and is not something that the server knows anything about. Ideally this would contain the _id field of the linking object (primary key) and perhaps the table name being linked to as well. Any idea if this is a big lift or is this something that can be easy to change for how this is sent to the server?

cc jonathan.reams@mongodb.com jorgen.edelbo@mongodb.com