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Speed up slow tests

type:test

Status: Open.

#15212 In apache/lucene;

· msokolov opened on Sep 22, 2025

Can IndexSearcher enable search concurrency by default? [LUCENE-10487]

legacy-jira-priority:Minor

type:task

Status: Open.

#11523 In apache/lucene;

· asfimport opened on Mar 28, 2022

Avoid allocations in IndexFileNames.parseGeneration method

module:core/index

Stale

Status: Open (in progress).

apache/lucenenumber 14920

#14920 In apache/lucene;

· doom369 opened on Jul 8, 2025

feat(nori): add metadata support to Korean tokenizer

module:analysis

Stale

Status: Open (in progress).

apache/lucenenumber 14969

#14969 In apache/lucene;

· twosom opened on Jul 20, 2025

Add delegate method copyFrom for FilterDirectory (#14985)

module:core/codecs

module:core/store

module:test-framework

Stale

Status: Open (in progress).

apache/lucenenumber 14987

#14987 In apache/lucene;

· velee opened on Jul 23, 2025

Make BitSet no longer implement Bits.

module:core/hnsw

module:core/index

module:core/search

module:grouping

module:join

module:misc

module:sandbox

module:spatial

module:suggest

module:test-framework

Status: Open (in progress).

apache/lucenenumber 14996

#14996 In apache/lucene;

· jpountz opened on Jul 28, 2025

Seal the BitSet class

type:enhancement

Status: Open.

#15038 In apache/lucene;

· jpountz opened on Aug 8, 2025

Record FST ramBytesUsed correctly

module:core/FSTs

Stale

Status: Open (in progress).

apache/lucenenumber 15133

#15133 In apache/lucene;

· dungba88 opened on Aug 27, 2025

chore: Seal BitSet to only allow FixedBitSet and SparseFixedBitSet

module:core/other

module:test-framework

Status: Open (in progress).

apache/lucenenumber 15161

#15161 In apache/lucene;

· AdityaTeltia opened on Sep 5, 2025

Make FSTPostingFormat to build FST off-heap

Stale

Status: Open (in progress).

apache/lucenenumber 12980

#12980 In apache/lucene;

· dungba88 opened on Dec 26, 2023

Feature/move long array group varint to backward codecs 15113

module:core/store

module:test-framework

Stale

Status: Open (in progress).

apache/lucenenumber 15186

#15186 In apache/lucene;

· SAKSHIC opened on Sep 16, 2025

Introduce support for pruning and skipping to FirstPassGroupingCollector

module:core/search

module:grouping

Stale

Status: Open (in progress).

apache/lucenenumber 15210

#15210 In apache/lucene;

· alexmm-amzn opened on Sep 22, 2025

Add asynchronous prefetch for DirectIO directory

module:misc

Stale

Status: Open (in progress).

apache/lucenenumber 15224

#15224 In apache/lucene;

· benwtrent opened on Sep 23, 2025

LUCENE-15108 commit writer before opening DirectoryReader to fix test

module:test-framework

Stale

Status: Open (in progress).

apache/lucenenumber 15233

#15233 In apache/lucene;

· VivekKumarNeu opened on Sep 26, 2025

Removing unused 9.x versions from backward-codecs

skip-changelogApply to PRs that don't need a changelog entry, stopping the automated changelog check.Apply to PRs that don't need a changelog entry, stopping the automated changelog check.

Stale

Status: Open (in progress).

apache/lucenenumber 15256

#15256 In apache/lucene;

· jainankitk opened on Sep 29, 2025

Remove the scorer on FlatVectorsReader

module:core/codecs

Stale

Status: Open (in progress).

apache/lucenenumber 15316

#15316 In apache/lucene;

· thecoop opened on Oct 9, 2025

Fix MaxScoreBulkScorer leaf-bound overshoot and prevent merging zero-score fragments

module:core/search

module:highlighter

Stale

Status: Open (in progress).

apache/lucenenumber 15346

#15346 In apache/lucene;

· kdt523 opened on Oct 21, 2025

Clarify the status of Kuromoji dictionaries

type:task

Status: Open.

#15365 In apache/lucene;

· dweiss opened on Oct 26, 2025

Introduce AllGroupsCollectorManager

module:grouping

Stale

Status: Open (in progress).

apache/lucenenumber 15557

#15557 In apache/lucene;

· gaobinlong opened on Jan 9, 2026

Refactor QueryCache to improve performance

module:core/index

module:core/search

module:test-framework

Stale

Status: Open (in progress).

apache/lucenenumber 15558

#15558 In apache/lucene;

· sgup432 opened on Jan 9, 2026

Introduce AllGroupHeadsCollectorManager

module:grouping

Stale

Status: Open (in progress).

apache/lucenenumber 15565

#15565 In apache/lucene;

· gaobinlong opened on Jan 13, 2026

Introduce FirstPassGroupingCollectorManager

module:grouping

Stale

Status: Open (in progress).

apache/lucenenumber 15574

#15574 In apache/lucene;

· gaobinlong opened on Jan 15, 2026

Introduce TopGroupsCollectorManager

module:grouping

Stale

Status: Open (in progress).

apache/lucenenumber 15603

#15603 In apache/lucene;

· gaobinlong opened on Jan 23, 2026

Compute 'length' of fields with custom term frequencies as docFreq

module:core/index

module:test-framework

Stale

Status: Open (in progress).

apache/lucenenumber 15584

#15584 In apache/lucene;

· msokolov opened on Jan 16, 2026

Deferring lambda in TermStates.java according to prefetch

module:core/codecs

module:core/index

module:core/store

module:test-framework

Stale

Status: Open (in progress).

apache/lucenenumber 15627

#15627 In apache/lucene;

· shubhamsrkdev opened on Jan 28, 2026