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Add documentation for index.knn.faiss.efficient_filter.disable_exact_search setting#12286

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Add documentation for index.knn.faiss.efficient_filter.disable_exact_search setting#12286
lawofcycles wants to merge 1 commit intoopensearch-project:mainfrom
lawofcycles:doc/knn-disable-exact-search-setting

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Description

Add documentation for the index.knn.faiss.efficient_filter.disable_exact_search index setting, which was added in opensearch-project/k-NN#3022 and released in OpenSearch 3.5.

This PR adds the setting to the index settings table in settings.md and adds a new "Disabling the exact search fallback" subsection to the Faiss k-NN filter implementation section in efficient-knn-filtering.md.

Issues Resolved

N/A

Version

3.5

Frontend features

N/A

Checklist

  • By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and subject to the Developers Certificate of Origin.
    For more information on following Developer Certificate of Origin and signing off your commits, please check here.

…search setting

This setting was added in opensearch-project/k-NN#3022 and released in
OpenSearch 3.5.

Changes:
- Add the setting to the index settings table in settings.md
- Add a new "Disabling the exact search fallback" subsection to the
  Faiss k-NN filter implementation section in efficient-knn-filtering.md

Signed-off-by: Sotaro Hikita <bering1814@gmail.com>
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Thank you for submitting your PR. The PR states are In progress (or Draft) -> Tech review -> Doc review -> Merged.

Before you submit your PR for doc review, make sure the content is technically accurate. If you need help finding a tech reviewer, tag a maintainer.

When you're ready for doc review, tag the assignee of this PR. The doc reviewer may push edits to the PR directly or leave comments and editorial suggestions for you to address (let us know in a comment if you have a preference).

@kolchfa-aws kolchfa-aws added backport 3.6 Tech review PR: Tech review in progress labels Apr 20, 2026
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@naveentatikonda Could you please review this PR?

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LGTM

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3 participants