Ghost contacts in spotlight
Michal, Thanks for answering your own question; that really helped me.

Spotlight searches on my two Macs were littered with phantom duplicate contacts. I was hesitant to go this approach until I read of your success. 

For future visitors, my steps were: 


You may want to backup Contacts (File - Export - Contacts Archive)
Quit Contacts.app
Turn off all contact sync services (System Prefs: Internet Accts: iCloud/Google: Contacts)
Move contents of ~/Library/Application Support/AddressBook/sources to Trash.  
Re-enable iCloud, Google, etc Contact sync.
Check address book in Contacts.
Test Spotlight Search: success.