Apache Lucene and Solr 4.4

Today Apache Lucene and Solr PMC announced another version of Apache Lucene library and Apache Solr search server numbred 4.4. 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 4.3 and 4.3.1 versions:


  • New replicator module that allows to replicate Lucene indices
  • AnalyzingInfixSuggester – finds suggestions using matches on any tokens, not only on prefix matches
  • FieldCache improvements – Ints and Longs are now using bit-packaging to save memory and memory usage for high cardinality string fields were improved
  • New features to Lucene faceting module, like dynamic numeric range faceting and hierarchy merging
  • ScandinavianFoldingFilter and ScandinavianNormalizationFilter were introduced
  • New SimpleMergeSegmentWarmer which ensures that internal data structures like term dictionary, docvalues are initialized
  • Compound file format is used by default by IndexWriter to flush segments
  • Known bugfixes and improvements


  • Ability to store and read Solr indices and transaction log directly from HDFS
  • Solr supports schemaless mode – Solr is able to guess the type of the field and add it to your schema.xml – no need to create the schema.xml upfront anymore. The example of schemaless mode can be found in the Apache Solr 4.4 distribution.
  • Support for creating copy fields using Schema API
  • New solr.xml file format allows for core discovery – instead of storing core information it searches for core.properties files
  • You can now upload binary files to ZooKeeper when using SolrCloud
  • You can now add documents to Solr by using Solr administration UI
  • In SolrCloud an Overseer can optionaly assign generic node names to avoid naming confusion
  • New information handler was added that exposes system information
  • Enchantments that comes with Apache Lucene 4.4

Full changes list for Lucene can be found at http://wiki.apache.org/lucene-java/ReleaseNote44. Full list of changes in Solr 4.4 can be found at: http://wiki.apache.org/solr/ReleaseNote44.

Apache Lucene 4.4 library can be downloaded from the following address: http://www.apache.org/dyn/closer.cgi/lucene/java/. Apache Solr 4.4 can be downloaded at the following URL address: http://www.apache.org/dyn/closer.cgi/lucene/solr/. Please remember that the mirrors are just starting to update so not all of them will contain the 4.4 version of Lucene and Solr.

This entry was posted on Tuesday, July 23rd, 2013 at 19:01 and is filed under About Lucene, About Solr. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.

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