Lucene and Solr 4.9

Today Apache Lucene and Solr PMC announced another version of Apache Lucene library and Apache Solr search server numbered 4.9. This is a next release continuing the 4th version of both Apache Lucene and Apache Solr.

Here are some of the changes that were made comparing to the 4.8.1:


  • New default format – Lucene49NormsFormat
  • Numerous search time doc values performance improvements
  • New posting format (IDVersionPostingsFormat) optimized for fields holding unique identifiers
  • All Lucene files are now written using OutputStream on all platforms


  • Support for re-ranking top N query results
  • New doc transformer allowing to include nested documents in results
  • Ability to specify minimal replication factor for an update request
  • Optimizations and bugfixes from Lucene 4.9

Full changes list for Lucene can be found at Full list of changes in Solr 4.8 can be found at:

Apache Lucene 4.9 library can be downloaded from the following address: Apache Solr 4.9 can be downloaded at the following URL address: Please remember that the mirrors are just starting to update so not all of them will contain the 4.9 version of Lucene and Solr.

This post is also available in: Polish

This entry was posted on Wednesday, June 25th, 2014 at 16:13 and is filed under About Lucene, About Solr. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.