Although this is not an Alfred bug, Alfred relies on the spotlight server (I believe) to index so I am not getting any indexed results.
I am not sure how I managed it (although I think it might be because I had spotlight disabled before upgrading to yosemite), but my spotlight server seems to be disabled. Trying any mdutil commands result in:
-07 08:55:25.673 mdutil[2360:239343] Metadata.framework [Error]: mdsCopyStorePaths failed: (268435459) (ipc/send) invalid destination port
Spotlight server is disabled.
All of the forums out there that have instructions to stop and start spotlight seem to reference plist service files in /System/Library/LaunchDaemons that do not exist in yosemite :-(