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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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API Changes

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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% approximately 4x less memory for fast HNSW search.
  • HNSW graph now can be merged with multiple

  • thread
  • threads, leveraging the same infrastructure that inter-segment concurrency utilizes.

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 share suffixes during FST construction using the suffixRAMLimitMB method. 

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Further details of changes are available in the change log available at: http://lucene.apache.org/core/9_9_0/changes/Changes.html

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

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