[rpgbr]

It's a little heterodox, but not hard at all[1] and it takes literally less than a minute to trigger the rebuilding.

[1] https://support.apple.com/en-us/102321

[jeffbee]

The ones I was reading involved recovery mode and editing inodes.

[alsetmusic]

I’ve rebuilt my spotlight db several times over the years by adding root to the exceptions list and removing. Whatever you found was going way overboard.