Django Solr search is a Django pluggable for rapidly integrating Solr search into a Django Application. It was originally written for a top 20 newspaper site. Readers where complaining that they were never able to find relevant content and they weren't given the tools to narrow down their search. With some of our past experiences with Solr it seemed like the obvious choice for this type of enterprise search concept.
Solr is an open source enterprise search server based on the Lucene Java search library, with XML/HTTP and JSON APIs, hit highlighting, faceted search, caching, replication, a web administration interface and many more features. It runs in a Java servlet container such as Tomcat.