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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

  • Create a TaskExecutor when an executor is not provided to the IndexSearcher, in order to simplify consumer's code 
  • 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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