Wikimedia Moving to Elastisearch Link

Seems like a significant and overdue change:

First a bit of background. All Wikimedia sites have been using a home-grown search system based on Apache Lucene since 2005 or 2006. It was written primarily by volunteer Robert Stojnić and is called lucene-search-2. This is a fantastic search engine, which has powered the sites for years now, and has managed to scale very well for the past 8 years or so. Early in 2013 this became a point of significant operational problems; short-term we were able to patch some of the most glaring issues in lucene-search-2 but it became increasingly apparent that a replacement was needed. Robert is no longer around and the system is showing its age.