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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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