Turn off spotlight:

sudo mdutil -a -i off

Unload it:

sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.metadata.mds.plist

Load It:

sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.metadata.mds.plist

Turn on spotlight again:

sudo mdutil -a -i on