THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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25th June 2023, Apache Lucene™ 9.7 available
The Lucene PMC is pleased to announce the release of Apache Lucene 9.7
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- The new IndexWriter#updateDocuments(Query, Iterable) allows updating multiple documents that match a query at the same time.
- Function queries can now compute similarity scores between kNN vectors.
Optimizations
- KNN indexing and querying can now take advantage of vectorization for distance computation between vectors. To enable this, use exactly Java 20 or 21, and pass
--add-modules jdk.incubator.vectoras a command-line parameter to the Java program. KNN queries now run concurrently if the IndexSearcher has been created with an executor.
- Queries sorted by field are now able to dynamically prune hits only using the
aftervalue. This yields major speedups when paginating deeply. - Reduced merge-time overhead of computing the number of soft deletes.
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- Backward reading is no longer an adversarial case for
BufferedIndexInput, used byNIOFSDirectoryandSimpleFSDirectory. This addresses a performance bug when performing terms dictionary lookups with either of these directories. GraphTokenStreamFiniteStrings#articulationPointsRecursemay no longer overflow the stack.- ... plus a number of helpful bug fixes!
Other
- 'explain' is now implemented on TermAutomatonQuery
- ... plus a number of helpful bug fixes!
Further details of changes are available in the change log available at: https://lucene.apache.org/core/9_7_0/changes/Changes.html.
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