Solr/Lucene 5 is a major release with lots of features and bug fixes. It is backward compatible with Solr4.x, but if you wish to upgrade from 3.x or older, you need to first upgrade to 4.x if you want to avoid reindexing all content. The main news for Solr in 5.x is start scripts and
The Apache Lucene project just released Apache Solr version 4.5. Please read the release announcement at http://lucene.apache.org/solr/solrnews.html#5-october-2013-apache-solr-45-available and see CHANGES.txt for all details. Some highlights are multi-threaded faceting (SOLR-2548), multi-threaded updates with CloudSolrServer (SOLR-4816) and more intelligent routing of documents with SolrCloud. Enjoy!
We have just sent our first email newsletter, highlighting new features in Solr 4.4 as well as new Solr training offerings in Oslo and Copenhagen this fall. If you wish did not receive it and want to subscribe to this newsletter for the future, please sign up here or fill in the form in the right-hand