For a long time now, I've kept Spotlight disabled because it constantly cranked away at my hard drive. I couldn't figure out why that was, until recently, when I had an epiphany:
- Spotlight updates its index when a file is updated.
- If Spotlight is updating constantly, one or more files must be getting constantly updated.
What sort of file gets constantly updated?
That's right. A log file.
So I added the folder with my IRC logs to the blacklist in the “Privacy” tab in Spotlight preferences, et voila, the constant indexing stopped.