Same problem, baloo isn’t working. I could solve it temporarily yesterday after tinkering but it will stop to work again, maybe when you restart the system.
The temporary procedure is:
this
balooctl disable
balooctl purge
systemctl reboot
balooctl enable
balooctl monitor
The last one is optional, but you can tell when it finishes. If it doesn’t work try again. I did it a couple of times.