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#15668: WeightedSpanTermExtractor is fragile to modern query rewrites due to DelegatingLeafReader ...
2.9 hours ago  4 comments  0 votes  0 watches  jainankitk, romseygeek, sjs004
Description The PlainHighlighter via WeightedSpanTermExtractor.javaL447 is prone to crashing when ... This happens because the internal DelegatingLeafReader used for highlighting throws UnsupportedOpera ... **The Recurrent Issue** As Lucene adds more optimizations to query rewrite() methods (e.g., ...
    sjs004 2.9 hours ago:  Hi @jainankitk @romseygeek I have raised the PR: https://github.com/apache/lucene/pull/15678 ...
    sjs004 2.3 days ago:  Thanks @romseygeek & @jainankitk . I will test with changes suggested by @romseygeek & raise a PR if it works without breaking any ...

#15678 PR: Fix Highlighter crash by implementing getFieldInfos in DelegatingLeafReader
3.2 hours ago  0 comments  0 votes  0 watches  github-actions[bot], sjs004
Fixes 15668 WeightedSpanTermExtractor uses an internal DelegatingLeafReader to provide a ... Historically, this reader did not implement getFieldInfos(), throwing an UnsupportedOperationExcepti ... In recent Lucene versions, several query types like SortedNumericDocValuesRangeQuery and ...

#15676 PR: Feature/collaborative hnsw search
4.5 hours ago  7 comments  0 votes  0 watches  benwtrent, github-actions[bot], krickert, navneet1v
[HNSW] Collaborative Search via Dynamic Threshold Feedback > **Status: Experimental** - This ... Full distributed multi-shard testing will happen in a follow-up PR for OpenSearch.
    krickert 4.5 hours ago:  Results from luceneutil: https://github.com/ai-pipestream/lucene-test-data/tree/main/ ...
    krickert 8.8 hours ago:  **EDIT – Initial tests look good.** I used luceneutil and ran the same KNN recall test against both ... Both gave **recall 0.996 (99.6%)** at K=100, consistent with current mainline and with what we ... No recall regression.

#15662: Lucene nightly benchmark regression on 29/01
5.7 hours ago  40 comments  0 votes  0 watches  benwtrent, epotyom, jpountz, mikemccand, msokolov, rmuir, scampi, shubhamsrkdev, stefanvodita, uschindler
Description We are seeing regressions on lucene nightly benchmarks on 29/01 The set of commits ... We should find the root cause of the regression. Version and environment details_No response_
    mikemccand 5.8 hours ago:  Aha, @jpountz also explained this on the luceneutil issue -- thank you! So, the JDK downgrade 25.0.2 -> 25.0.1 did NOT recover the performance, sigh (annotation JT). I'll next try reverting this: > [2026-01-29T13:28:43-0500] [ALPM] upgraded amd-ucode (20250917-1 - ...
    mikemccand 5.9 hours ago:  > Hmm we somehow stopped running the CombinedFieldsQuery benchy (data ended Nov 2024!) -- I'll open a luceneutil issue. Phew -- this is a false alarm -- we just renamed the tasks so we could separately test AND and OR.

#15612: Cluster Based ANN Vector Search for Lucene
1.1 days ago  20 comments  0 votes  0 watches  Vikasht34, atris, benwtrent, navneet1v, vigyasharma
Our current HNSW vector search is great with low latency and high recall, but comes with its own ... Graph based algos are memory intensive which make them hard to scale. And they don't work well with segment merge.
    atris 1.1 days ago:  Currently, the PR post-filters search results during the fine phase, scanning allowed vectors ... This avoids zero results for populated partitions but remains sensitive to disjoint query/filter ... Pruning via minSimilarity (and integrating with/emulating #15676) is a planned optimization to ...
    navneet1v 1.1 days ago:  Hi @vigyasharma , @atris Thanks for adding this idea. I see that on this thread we have been discussing mainly on indexing, I would like to add some ... Similar to current HNSW search implementation we should add the concept of minSimilarity score to ...

#15667 PR: Use bulk scoring in NeighborArray#isWorstNonDiverse
1.3 days ago  17 comments  0 votes  0 watches  ML-dev-crypto, benwtrent, github-actions[bot], navneet1v
This change updates NeighborArrayisWorstNonDiverse to use the RandomVectorScorerbulkScore API, ... The bulkScore method is a default interface method and safely falls back to per-node scoring when ... Fixes 15606
    ML-dev-crypto 1.3 days ago:  > @ML-dev-crypto do we know what is the impact in performance because of this change? Thanks for the question. Theoretically, this change eliminates array allocations in the hot path of graph construction and ...
    navneet1v 1.6 days ago:  @ML-dev-crypto do we know what is the impact in performance because of this change?

#15027 PR: Optimize prefix sum computation in Lucene99HnswVectorsReader; fixes #15024
1.8 days ago  18 comments  0 votes  0 watches  benwtrent, github-actions[bot], jpountz, msokolov, yossev
Replaced the two-step prefix sum loop in Lucene99HnswVectorsReader with a single-loop variant that ... Previous approach: - Read first value separately.
    github-actions[bot] 2.8 months ago:  This PR has not had activity in the past 2 weeks, labeling it as stale. If the PR is waiting for review, notify the dev@lucene.apache.org list. Thank you for your contribution!
    benwtrent 3.3 months ago:  Hello @yossev friendly ping :). Once conflicts & formatting are fixed, I can merge and backport. We should also have a CHANGES entry under optimizations for 10.4.0

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