Well, I’m not the only one!
The inability to use the Messages app on the Mac to search message history is really a nuisance. That, and I’m noticing Spotlight search in general seems to really be crappy lately. I wrote this a while back which seemed to kickstart Spotlight back to life:
sudo mdutil -a -i off sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.metadata.mds.plist sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.metadata.mds.plist sudo mdutil -a -i on
But it doesn’t work under Mojave. Bummer.