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)

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