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XX December 2019, Apache Lucene™ 8.4.0 available

The Lucene PMC is pleased to announce the release of Apache Lucene 8.4.0.

Apache Lucene is a high-performance, full-featured text search engine library written entirely in Java. It is a technology suitable for nearly any application that requires full-text search, especially cross-platform.

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

Please read CHANGES.txt for a full list of new features and changes:

https://lucene.apache.org/core/8_4_0/changes/Changes.html

Lucene 8.4.0 Release Highlights:

New Features

  • LatLonShape now supports the "CONTAINS" relation, which enables to find all indexed shapes that contain the query shape.

Optimizations & Improvements

  • Concurrent search is getting more efficient by allowing collectors to share information across threads in order to more efficiently skip non-competitive hits.
  • Faster FST lookups on dense nodes.
  • Postings are now decoded using SIMD instructions.
  • LRUQueryCache includes new heuristics that prevent caching from hurting latency too much.

  • LatLonShape builds a more efficient tree that is expected to translate into search speed improvements.
  • BaseDirectoryReader no longer sums up document counts across leaves eagerly, allowing for more efficient reader views that hide a subset of documents.
  • The index on top of BKD trees is now stored off-heap with MMapDirectory.
  • Simple Intervals Queries supports highlighting.
  • Reading DocValues can be interrupted when timeout is exceeded.


Further details of changes are available in the change log available at: https://lucene.apache.org/core/8_4_0/changes/Changes.html

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

Note: The Apache Software Foundation uses an extensive mirroring network for distributing releases. It is possible that the mirror you are using may not have replicated the release yet. If that is the case, please try another mirror. This also applies to Maven access.

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