Got some clarification, the readme (for the past multiple years) has always said to simply run occ docker exec -it nextcloud occ that section was unfortunately removed on accident recently (though you didn’t read the readme even before, so you wouldn’t have noticed 
unraiders gonna unraid, right 
)
anyway, run as I directed above to resolve your indexing issues. Ensure you read the readme and the notice about our changes. Let us know if you have any other issues.