Apache Lucene 9.1.0 Release: New Features, Optimizations, and Other Improvements
Apache Lucene 9.1.0 introduces modular JAR organization, nearest‑neighbor vector search support, internal query syntax, a Spanish plural stem filter, significant throughput and speed gains for high‑dimensional vectors, faster count queries, and various other enhancements and test framework changes.
Apache Lucene has released version 9.1.0. Compared with version 9.0, this release mainly improves the following aspects:
New Features
Lucene JARs are organized using Java modularization, providing module descriptors and dependency information.
Filters now support nearest‑neighbor vector search.
The standard query syntax supports inner queries.
A brand‑new token filter, SpanishPluralStemFilter , provides precise stemming for Spanish plurals.
Optimizations
Indexing throughput for high‑dimensional vectors improves by 30%.
Search speed for high‑dimensional adjacency vectors improves by 10%.
Count searches across different query types are faster.
Computation of classification aggregation information is faster.
Other minor search speed improvements, including enhancements to PointRangeQuery , MultiRangeQuery , and CoveringRangeQuery .
Other
The test framework has also been modularized; all package names are changed to org.apache.lucene.tests.* to avoid naming conflicts.
Lucene now faithfully implements the HNSW algorithm for nearest‑neighbor search by supporting multiple graph layers.
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