spotlight indexing not working
I'm running Mojave on a MBP early 2015.
Spotlight has stopped working on my internal drive and 3 USB drives.
I've tried using the Spotlight Privacy tab tricks in System Preferences and, when that didn't work, the terminal 'sudo mdutils -E' approach.
The Terminal response is
Error: unknown indexing state
Not sure what to do. I've searched for how to rebuild index from scratch or any other approach to restore to a known state and then proceed from there.
Any other ideas of what to try?