Every day hundreds of thousands of users come to Redbubble searching for art works. Given the large number of works on Redbubble – we host millions of works for our ever-growing community of artists – it’s important that our search engine return good results, because our users sure ain’t going to paginate through millions of works! Standing between us and our quest to produce relevant search results was our 3-year old Solr 3.6. It’s not so much the age that was bothering us, but rather its lack of boolean and relevance functions. Add in the fact that Solr 3.6’s higher memory demand was causing occasional performance problems, we had a solid case to say goodbye to this fella. So we