[nonirosenfeldredis]

Describe the changes in the pull request

1. Current: VecSim reuses the internal id of an updated vector in the tiered HNSW index. That path takes an exclusive main-index lock for every in-place insert, which cut vector-update throughput (about 1.1k vs 4.4k ops/s in a local run).
2. Change: Advance the VecSim submodule to the commit that removes id reuse from the tiered HNSW index ([MOD-19327] Remove id reuse from the tiered HNSW index RedisAI/VectorSimilarity#1085). The previous pin is the commit right before it, so this pulls in that change only.
3. Outcome: Vector updates no longer take the exclusive lock for id reuse. The reuse is only in 8.12 pre-release builds (first in v8.11.90), not in 8.10 or earlier. Insert-path reuse (off by default) is a separate follow-up in VecSim.

Which additional issues this PR fixes

1. MOD-19327

Main objects this PR modified

1. deps/VectorSimilarity submodule pointer.

Mark if applicable

• This PR introduces API changes
• This PR introduces serialization changes

Release Notes

• This PR requires release notes
• This PR does not require release notes

🤖 Generated with Claude Code

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-29T23:28:07.691673Z	0a5d8a0	New commits

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.92%. Comparing base (3dd97c1) to head (0a5d8a0).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #12074      +/-   ##
==========================================
- Coverage   83.93%   83.92%   -0.01%     
==========================================
  Files         688      688              
  Lines       89404    89425      +21     
  Branches    11578    11578              
==========================================
+ Hits        75037    75054      +17     
- Misses      10673    10684      +11     
+ Partials     3694     3687       -7     

Flag	Coverage Δ
flow	72.28% <ø> (-0.06%)	⬇️
unit	58.62% <ø> (-0.20%)	⬇️

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud