Hi ! I would like to query_by a field that is optional. So in the index, the documents where the field=null do not have the field at all. How to query_by where field is not null ?

Prior discussion on this: https://typesense-community.slack.com/archives/C01P749MET0/p1678920859745439?thread_ts=1678916915.291589&channel=C01P749MET0&message_ts=1678920859.745439

Thanks!