Issues

• Lucene104ScalarQuantizedVectorsWriter includes deleted docs when recalculating the centroid

  type:bug
  apache/lucene#16762 · Filter by author Pulkitg64 opened on Oct 2, 2026

• A briefly saturated intra-merge executor can serialize an entire HNSW graph merge

  type:bug
  apache/lucene#16729 · Filter by author abernardi597 opened on Sep 28, 2026
  3

• InitializedHnswGraphBuilder.rebalanceGraph() bypasses HnswGraphBuilder.randSeed — intentional?

  apache/lucene#16726 · Filter by author xzhang9292 opened on Sep 27, 2026
  1

• Complete FP16 (float16) vector support across Lucene

  type:task
  apache/lucene#16725 · Filter by author Pulkitg64 opened on Sep 27, 2026
  3

• Add Sinhala language analyzer (si)

  type:enhancement
  apache/lucene#16724 · Filter by author indrajithek opened on Sep 27, 2026
  3

• MUST_NOT + IndexOrDocValuesQuery: much slower on 10.x than 9.x/8.x

  type:bug
  apache/lucene#16702 · Filter by author mkierus opened on Sep 22, 2026
  5

• LogMergePolicy has no explicit delete-driven merge selection

  type:enhancement
  apache/lucene#16701 · Filter by author salvatorecampagna opened on Sep 22, 2026

• IndexSortSortedNumericDocValuesRangeQuery should support floats and doubles

  type:enhancement
  apache/lucene#16698 · Filter by author HoustonPutman opened on Sep 21, 2026 · 11.0.0
  

• [ENH] Improve DocValues bulk decoding using Panama Vector API

  type:enhancement
  apache/lucene#16677 · Filter by author CH-Abhinav opened on Sep 15, 2026
  2

• Can we speed up centroid calculation in the OSQ vector format?

  type:enhancement
  apache/lucene#16674 · Filter by author kaivalnp opened on Sep 15, 2026
  3

• Tighten left-bound of MemoryAccountingBitsetCollectorManager.Result#bitSet

  type:enhancement
  apache/lucene#16649 · Filter by author Sasilekha opened on Sep 7, 2026
  2

• Azerbaijani language support

  type:task
  apache/lucene#16646 · Filter by author pullsuzdesheloper opened on Sep 7, 2026

• Optimize non-scoring minimum-should-match queries that fall back to WANDScorer

  type:enhancement
  apache/lucene#16626 · Filter by author kkewwei opened on Sep 3, 2026
  2

• IndexWriter rollback deletes uncommitted segment files while pooled readers are still open

  type:bug
  apache/lucene#16625 · Filter by author LuXugang opened on Sep 3, 2026

• HNSW merge-reuse graph repair runs single-threaded on the merge thread, slowing down merges

  type:bug
  apache/lucene#16618 · Filter by author ethbak opened on Sep 2, 2026
  2

• Improvements to the sandboxed de-duplicating vector format

  type:enhancement
  apache/lucene#16595 · Filter by author kaivalnp opened on Sep 1, 2026 · 12.0.0
  1

• Filtered kNN: accept set built one doc at a time with deletions, cached filter bypassed, every vector scanned for small filters, off-heap lookup per accept test on sparse fields

  apache/lucene#16586 · Filter by author john-mlika opened on Aug 30, 2026
  3

• Separate term bytes pool from postings pool in TermsHash

  type:enhancement
  apache/lucene#16574 · Filter by author neoremind opened on Aug 28, 2026
  5

• Should we move vector bulk-scoring APIs to VectorUtilSupport?

  type:enhancement
  apache/lucene#16556 · Filter by author kaivalnp opened on Aug 25, 2026
  4

• Should we enable the check CheckedExceptionNotThrown in error prone?

  apache/lucene#16545 · Filter by author iverase opened on Aug 22, 2026
  2

• Implement quantization on fp16 directly without inflating to fp32

  type:enhancement
  apache/lucene#16533 · Filter by author Pulkitg64 opened on Aug 19, 2026
  2

• Avoid per-document int[] allocation in BytesRefHash#shrink() for term vectors path

  type:enhancement
  apache/lucene#16507 · Filter by author neoremind opened on Aug 12, 2026

• Support optional pre-building QueryCache for newly generated segments

  type:enhancement
  apache/lucene#16495 · Filter by author kkewwei opened on Aug 6, 2026
  5

• Stored fields and term vectors do not detect a corrupt chunk on the read path

  apache/lucene#16479 · Filter by author serhiy-bzhezytskyy opened on Aug 2, 2026
  1

• [ENH] Opt-In Roaring Bitmap Indexing for High-Cardinality Multi-Valued Aggregations

  type:enhancement
  apache/lucene#16477 · Filter by author rajat315315 opened on Aug 2, 2026
  1