13 Dec 2024, Apache Lucene™ 9.12.1 available

The Lucene PMC is pleased to announce the release of Apache Lucene 9.12.1.

Apache Lucene is a high-performance, full-featured text search engine library written entirely in Java. It is a technology suitable for nearly any application that requires full-text search, especially cross-platform.

This patch release contains bug fixes that are highlighted below. The release is available for immediate download at:

https://lucene.apache.org/core/downloads.html

Lucene 9.12.1 Release Highlights

Improvements

• Allow easier configuration of the Panama vectorization provider with newer Java versions. Set the `org.apache.lucene.vectorization.upperJavaFeatureVersion` system property to increase the set of Java versions that Panama vectorization will provide optimized implementations for. (Chris Hegarty)

Bug fixes

• Fixed backwards compatibility bug that caused sparse (not all documents have a vector) KNN indices written with 9.0.0 to give silently (no exception) terrible recall results when searched by any 9.x release (Michael Sokolov, Ben Trent)
• Improve Tessellatorlogic when two holes share the same vertex with the polygon which was failing in valid polygons. (Ignacio Vera)
• Fix backwards compatibility bug that caused 9.12.0 to incorrectly throw IllegalStateException when trying to open an IndexReader on an index created with quantized (int4, int7, int8) KNN vectors using Lucene99HnswScalarQuantizedVectorsFormat. (Ionut Anghelcovici, Michael McCandless)

... plus more helpful bug fixes!

Further details of changes are available in the change log available at: http://lucene.apache.org/core/9_12_1/changes/Changes.html. 

Please report any feedback to the mailing lists (http://lucene.apache.org/core/discussion.html)

Note: The Apache Software Foundation uses an extensive mirroring network for distributing releases. It is possible that the mirror you are using may not have replicated the release yet. If that is the case, please try another mirror. This also applies to Maven access.