Solr 4.0

Solr 4.0 has not yet been released.

Please see Solr Development for links to nightly builds that contain the latest 4.0 functionality.

Solr 4.0 refers to the next hypothetical release off of the common trunk that was created after it was decided that the development of Solr and Lucene-Java should be more tightly integrated, (the version number comes from following the Lucene-Java release version convention).

This is slated to be the first release of Solr that will require the use of Java 1.6. (the primary motivation for adding this requirement being SolrCloud functionality)

If you found a link to this page in some documentation it was there to alert you to the fact that it described a feature that is expected to be included in the Solr 4.0 when it happens. Jira can show you issues that people have (or hope to) incorporated into the 4.0 release.

Update: In january 2012 the developers have started talking for real about preparing for the first Solr 4.0 alpha release. No dates or roadmap are given however.

Once Solr 4.0 has been released, this page may be updated if there are any errata for the release documentation that users should be aware of.