Spotlight search result for contact does not open found contact in Address Book
I resolved it by brute force.


Open Spotlight in System Preferences.
Remove everything except PDF.
Add my home folder to excluded items in Privacy tab.
Reboot.
Open Spotlight.
Remove my home folder from excluded items in Privacy tab.
Add Contacts to items indexed by Spotlight.


Presto, it's working again. I hope it keeps working.