CreateLookupVindex is a new VReplication workflow that was introduced in Vitess 6. It is used to create and backfill a lookup Vindex automatically for a table that already exists and that could already have a significant amount of data in it.
The CreateLookupVindex process uses VReplication for the backfill process, until the lookup Vindex is “in sync”. Then the normal process for adding/deleting/updating rows in the lookup Vindex via the standard transactional flow when updating the “owner” table for the Vindex takes over.
You can read more about how to make a CreateLookupVindex here. If you are unfamailar with Vindexes we recommend that you first read the information here.