Search API endpoint changed expected response

[arpascual]

Hi, I just noticed that the Search endpoint is not returning the same results as of yesterday. 

For example if I used this query before: ```track:Electric Fling artist:Stefano Breda``` it would respond with like 20 items similar to that search [amongst them Steve Bread - Electric Fling which is actually on Spotify]. Now it just returns an empty array. It seems as if they've changed the algorithm that return similar tracks and constrained it much more. I was relying on that kind of response, but now my results are incorrect because of that. Does anybody know what's happening?