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.

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
 * Improve Tessellatorlogic when two holes share the same vertex with
   the polygon which was failing in valid polygons.
 * 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.
   
... 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. 

-Chris.
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