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https://lucene.apache.org/core/downloads.html
Lucene 9.
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9.0 Release Highlights
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- Make TaskExecutor constructor public and use TaskExecutor for concurrent HNSW graph build.
New Features
- Add int8 scalar quantization to the HNSW vector format. This optionally allows for more compact lossy storage for the vectors, requiring about 75% memory for fast HNSW search.
- HNSW graph now can be merged with multiple thread.
Improvements
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- 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.
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