The Lucene PMC is pleased to announce the release of Apache Lucene 9.9.0.
Apache Lucene is a high-performance, full-featured search engine library written entirely in Java. It is a technology suitable for nearly any application that requires structured search, full-text search, faceting, nearest-neighbor search across high-dimensionality vectors, spell correction or query suggestions.
This release contains numerous bug fixes, optimizations, and improvements, some of which are highlighted below. The release is available for immediate download at:
https://lucene.apache.org/core/downloads.html Lucene 9.9.0 Release Highlights: New Features• Add int8 scalar quantization to the HNSW vector format. This optionally allows for more compact lossy storage for the vectors, requiring approximately 4x less memory for fast HNSW search. • HNSW graph now can be merged with multiple threads, leveraging the same infrastructure that inter-segment concurrency utilizes.
Improvements • Speed up Panama vector support, use FMA, and test improvements.• FSTCompiler can now approximately limit how much RAM it uses to share suffixes during FST construction using the suffixRAMLimitMB method.
Optimizations• Faster top-level conjunctions on term queries when sorting by descending score. • Change Postings back to using FOR in Lucene99PostingsFormat. Freqs, positions and offset keep using PFOR.
... plus a multitude of helpful bug fixes! Please read CHANGES.txt for a full list of new features and changes: https://lucene.apache.org/core/9_9_0/changes/Changes.html -Chris.
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