Hmmm , no luck 🙁
Althought I don't think it's happening as often now that I've reduced the search result categories.
It just happened to me again too. I am going to post this to Apple Support forums and see if I can get someone. I will post back any responses I get. Someone will solve this issue for us.
Here is the link if you want to monitor it from there:
http://discussions.apple.com/thread.jspa?threadID=2104824&stqc=true
EDIT:
I found this solution from Apple Support and am trying it now. One thing that you do need to do after those steps, is index the drive.
solution:
go to spotlight preferences uncheck every file type for spotlight to index
dragging the folder to the ignore list reports unknown error, skip dragging the
drive to the ignore list
go to terminal
sudo rm -fr /Volumes/your drive name/.spotlight-V100
and repeat command, after about 20 times in a row of repeating the comamnd
spotlight is now fixed
go to spotlight preferences and check on all file types again
theory:
continuous repeating use of the sudo rm -fr command causes spotlight index
to be deleted at just the right moment before the thread 12 crash
or the time between retries, and whatever was corrupt in the actual
/.spotlight-v100/ folder was erased, thus curing this problem.
or
continuous repeating of the sudo rm -fr command at the right moment
deletes a corrupted file which would of maybe been locked and maybe
that locked file was either not getting actually deleting, or spotlight
was crashing on that mysterious file in the /.spotlight-v100 directory