# OpenSearch Lucene Study Group Meeting - Monday, March 11th, 2024

**URL:** <https://forum.opensearch.org/t/opensearch-lucene-study-group-meeting-monday-march-11th-2024/18294>\
**Category:** Community\
**Tags:** community-meeting\
**Created:** [March 7, 2024, 7:27pm UTC](https://forum.opensearch.org/t/opensearch-lucene-study-group-meeting-monday-march-11th-2024/18294 "2024-03-07T19:27:02Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![msfroh](https://avatars.discourse-cdn.com/v4/letter/m/34f0e0/32.png) [@msfroh](https://forum.opensearch.org/u/msfroh)\
**Post date:** [March 7, 2024, 7:27pm UTC](https://forum.opensearch.org/t/opensearch-lucene-study-group-meeting-monday-march-11th-2024/18294/1 "2024-03-07T19:27:02Z")

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Sign up to join the meeting at Meetup:

> **[OpenSearch Lucene Study Group, Mon, Mar 11, 2024, 9:00 AM | Meetup](https://www.meetup.com/opensearch/events/299658202/)**
>
> Welcome to the OpenSearch Lucene Study Group!
> 
> \[Apache Lucene\](https://lucene.apache.org/) is the open-sourced search library that powers OpenSearch and many search applica

Link to previous meeting’s post: [OpenSearch Lucene Study Group Meeting - Monday, March 4th, 2024](https://forum.opensearch.org/t/opensearch-lucene-study-group-meeting-monday-march-4th-2024/18223)

Welcome to the OpenSearch Lucene Study Group!

[Apache Lucene](https://lucene.apache.org) is the open-sourced search library that powers OpenSearch and many search applications large and small.

We start the meeting with a Lucene learning topic or Q&A session. In the second half of the meeting, we review recent developments in Apache Lucene and discuss their potential impact to OpenSearch, with a particular focus on new and exciting Lucene features that we can (and should) expose through OpenSearch. Since some changes require a deep dive to fully understand, we sometimes ask participants to volunteer for “homework” to dig deeper into changes and report back for the next meeting.

Standing Agenda:

- Welcome / introduction (5 minutes)
- Lucene learning series - someone will either present a Lucene-related talk or we will do Lucene Q&A (20 minutes, recorded)
- Review assigned issues from last time (10 minutes)
- Review new Lucene changes and assign homework (20 minutes)

_By joining the OpenSearch Lucene Study Group Meeting, you grant OpenSearch, and our affiliates the right to record, film, photograph, and capture your voice and image during the OpenSearch Community Meeting (the “Recordings”). You grant to us an irrevocable, nonexclusive, perpetual, worldwide, royalty-free right and license to use, reproduce, modify, distribute, and translate, for any purpose, all or any part of the Recordings and Your Materials. For example, we may distribute Recordings or snippets of Recordings via our social media outlets._

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<div class="post-metadata">

**Author:** ![msfroh](https://avatars.discourse-cdn.com/v4/letter/m/34f0e0/32.png) [@msfroh](https://forum.opensearch.org/u/msfroh)\
**Post date:** [March 11, 2024, 3:52pm UTC](https://forum.opensearch.org/t/opensearch-lucene-study-group-meeting-monday-march-11th-2024/18294/2 "2024-03-11T15:52:12Z")

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This week’s Lucene changes:

| Version | Category | Description | Link |
| --- | --- | --- | --- |
| Lucene 9.11.0 | Improvements | Hunspell: allow ignoring exceptions on duplicate ICONV/OCONV mappings | [https://github.com/apache/lucene/issues/13155](https://github.com/apache/lucene/issues/13155) |
| Lucene 9.11.0 | Improvements | Hunspell: don't proceed with other suggestions if we found good REP ones | [https://github.com/apache/lucene/issues/13156](https://github.com/apache/lucene/issues/13156) |
| Lucene 9.11.0 | Optimizations | Speedup multi-segment HNSW graph search for diversifying child kNN queries. Builds on GITHUB#12962. | [https://github.com/apache/lucene/issues/13121](https://github.com/apache/lucene/issues/13121) |
| Lucene 9.11.0 | Bug Fixes | Hunspell GeneratingSuggester: ensure there are never more than 100 roots to process | [https://github.com/apache/lucene/issues/13154](https://github.com/apache/lucene/issues/13154) |
| Lucene 9.11.0 | Bug Fixes | Fix NPE when LeafReader return null VectorValues | [https://github.com/apache/lucene/issues/13162](https://github.com/apache/lucene/issues/13162) |