Audit trail columns are not available for using in search/query from Search service
Check this enclosed file to see what is exposed from Storage service (Get record) and what is exposed from Search Service query.
"createUser": "Debasis.Chatterjee@katalystdm.com", "createTime": "2021-05-01T00:34:26.213Z"
The above two fields are not available for Search, it seems.
There are use cases where we would need to know records created since certain date and records created by certain user.
This gap would impair that kind of capability.
Please check and advise.