I have a project created with version 6.2 of XCode.
After adding indexing for CoreSpotlight (indexSearchableItems reports success), no results are found in Spotlight search.
I then recreated the same project (with, to the best of my knowledge, the same settings) on XCode 7.3.0 and it worked as expected (ie search results are found).
Anyone have an idea as to why ? Is there a setting that needs changed in the project ?