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16 June 2021, Apache Lucene™ 8.9 available

The Lucene PMC is pleased to announce the release of Apache Lucene 8.9.

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Lucene 8.9 Release Highlights

  • Compression was added to SortedSet DocValues, which allowed to significantly reduce their size on disk.
  • BM25FQuery was extended to handle similarities beyond BM25Similarity. It was renamed to CombinedFieldQuery to reflect its more general scope.
  • A new PatternTypingFilter was added to allow setting a type attribute on tokens based on a configured set of regular expressions.
  • An option was added to supply a custom leaf sorter for IndexWriter and DirectoryReader, which allows to speed up sort queries with a provided sort criteria. Enable bulk merge for stored fields with index sort. Merging of stored fields that are used for index sorting is done now through bulk-merges (i.e., raw chunk copying), which reduces the merge time for these fields by 20%.

Further details of changes are available in the change log available at: http://lucene.apache.org/core/8_9/changes/Changes.html

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