Update release notes for 2.19.5

[Divyaasm]

Description

[Describe what this change achieves]

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[github-actions]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

🧪 No relevant tests

🔒 No security concerns identified

✅ No TODO sections

🔀 No multiple PR themes

⚡ Recommended focus areas for review Missing Entry The entry 'Fix SearchPhaseExecutionException to properly initCause' was removed from the release notes entirely. It was previously listed under 'Enhancements' but has not been moved to any other section. Verify whether this fix should be included in the release notes under 'Bug Fixes' or another appropriate section. ### Bug Fixes * Add case sensitivity as an argument to XContentMapValues.filter ([#19976](https://github.com/opensearch-project/OpenSearch/pull/19976)) * Fix segment replication failure during rolling restart ([#20498](https://github.com/opensearch-project/OpenSearch/pull/20498))

[github-actions]

PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Impact
General	Misclassified feature entry under bug fixes The entry "Add case sensitivity as an argument to XContentMapValues.filter" appears to be a feature addition rather than a bug fix. Moving it to the "Bug Fixes" section is misleading and may confuse users reading the release notes. Consider restoring the "Features" section or placing it under a more appropriate category. release-notes/opensearch.release-notes-2.19.5.md [7-8] +### Features + * Add case sensitivity as an argument to XContentMapValues.filter ([#19976](https://github.com/opensearch-project/OpenSearch/pull/19976)) + +### Bug Fixes + * Fix segment replication failure during rolling restart ([#20498](https://github.com/opensearch-project/OpenSearch/pull/20498)) Suggestion importance[1-10]: 6 __ Why: The suggestion raises a valid concern that "Add case sensitivity as an argument to XContentMapValues.filter" is a feature addition being placed under "Bug Fixes," which could mislead users. However, this is a documentation/categorization issue rather than a code correctness problem, and the PR author may have intentionally recategorized it.	Low

[opensearch-trigger-bot]

The backport to main failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Navigate to the root of your repository
cd $(git rev-parse --show-toplevel)
# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/OpenSearch/backport-main main
# Navigate to the new working tree
pushd ../.worktrees/OpenSearch/backport-main
# Create a new branch
git switch --create backport/backport-20845-to-main
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 ea7527bc3e5502850936d7553119085aa3cc1c06
# Push it to GitHub
git push --set-upstream origin backport/backport-20845-to-main
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/OpenSearch/backport-main

Then, create a pull request where the base branch is main and the compare/head branch is backport/backport-20845-to-main.