Index in Spotlight on an entity relationship

I'm implementing CoreSpotlight searching on my Core Data store. The Index in Spotlight checkbox appears in Xcode for Relationships but when I check it and then run a spotlight search it does not find my entity based on the relationship value. What am I missing? Is there more to the process?


For example, if I have an entity of Event and another for Keyword with a relationship between them I would expect that checking Index on the relationship from Event to Keyword would return the event for Basketball Game if I searched for the keyword Sport.