On 12th October 2012 the Apache Foundation released a major update to the open source search engine building tools Lucene and Solr . Version 4.0 adds several new features aimed at making Solr easier to use, more scalable and more customizable. Although they’re jointly developed, Lucene and Solr are actually two different things. Lucene is just a Java library, not a stand alone search engine. Solr is a search engine server built with Lucene as its core. Lucene was created in 1999 by Doug Cutting, better known as the creator of Apache Hadoop , and has been used both companies like AOL and LinkedIn to power search features. Solr was created by Yonik Seeley in 2004. It can be used as a custom search engine, or be used to power search for a separate application. Scalability was the Solr/Lucene team’s biggest focus for today’s release, according to Search Engine Hub — particularly scaling out as opposed to scaling up. Web companies like Google and Amazon.com have popul