I think we are actually almost exactly on the same page here. I have from time to time (and now provoked by "misbehavior" of the Spotlight feature) run::
DISM /online /Cleanup-Image /RestoreHealth
Restart from the main menu submenu
sfc /scannow
Restart from the main menu submenu
I am quite prepared to believe the "cold boot" restart resulting from shutdown -r -t 0 might be preferable to the "hot restart" I have been using, and to change my practices accordingly.
In the meantime, as a lifelong experimental scientist, I am curious to discover whether or not the DISM/sfc procedure has actually "repaired" the Spotlight function. I can't see that this experiment carries any risk at all.