I ran into this yesterday. My entire machine was running slow. I checked Activity Monitor and it was mediaanalysisd running at 100% for about an hour. i couldn't kill it as it would just restart. A search said I was S.O.L. unless I disabled SIP. (can't, it's a work laptop)

Further, Spotlight is completely broken in Tahoe. I have all categories off in System Preferences except Apps because it's the only thing I use or want to use spotlight for, a quick way to launch apps. But as of Tahoe 26.2 or so Spotlight is showing tons of non-app results so it's no longer useful as an app launcher.