[Backport main] [AUTO] Add release notes for 3.5.0

[opensearch-trigger-bot]

Backport 9d1f4fc from #20534.

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds OpenSearch/OpenSearch Dashboards version 3.5.0 release notes document. The document details new features, behavioral changes, bug fixes, dependency updates, and removals across Added, Changed, Fixed, Dependencies, and Removed categories with associated PR references.

Changes

Cohort / File(s)	Summary
Release Notes release-notes/opensearch.release-notes-3.5.0.md	New release notes document for version 3.5.0 listing features, improvements, fixes, and dependency changes.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Suggested labels

release

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The description is minimal but appropriate for a backport PR; however, it lacks structured information per the template's required sections like formal Description and Related Issues.	Consider providing a more detailed description following the template with explicit Description section and Related Issues reference to #20534.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes adding release notes for version 3.5.0, which matches the main change in the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch backport/backport-20534-to-main

---

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@release-notes/opensearch.release-notes-3.5.0.md`:
- Line 53: Update the release note sentence "LeafReader should not remove
SubReaderWrappers incase IndexWriter encounters a non aborting Exception
([`#20193`])" by hyphenating "non-aborting" (i.e., change "non aborting" to
"non-aborting") so the line reads with correct hyphenation; locate the exact
string shown (including the reference [`#20193`]) and make the single-word
replacement.

📜 Review details

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 42abf94 and 4002015.

📒 Files selected for processing (1)

• release-notes/opensearch.release-notes-3.5.0.md

🧰 Additional context used

🧠 Learnings (1)

📚 Learning: 2026-01-02T19:23:29.698Z

Learnt from: karenyrx
Repo: opensearch-project/OpenSearch PR: 20335
File: modules/transport-grpc/src/main/java/org/opensearch/transport/grpc/proto/request/search/SearchSourceBuilderProtoUtils.java:155-172
Timestamp: 2026-01-02T19:23:29.698Z
Learning: The gRPC search API in OpenSearch is marked as "experimental" in official documentation, so changes to proto schemas that remove previously unsupported fields (those throwing UnsupportedOperationException) are not considered breaking changes.

Applied to files:

• release-notes/opensearch.release-notes-3.5.0.md

🪛 LanguageTool

release-notes/opensearch.release-notes-3.5.0.md

[grammar] ~53-~53: Use a hyphen to join words.
Context: ...pers incase IndexWriter encounters a non aborting Exception ([#20193](https://git...

(QB_NEW_EN_HYPHEN)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (19)

• GitHub Check: detect-breaking-change
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