[IM] Add missing values to the index details flyout

[yuliacech]

Fixes #123714

Summary

This PR adds back missing values for "Docs Deleted" and "Primary Storage Size" displayed in the index details flyout. These values have probably been removed in this PR#28855 but can found in Index Stats API.

How to test

1. Start ES and Kibana with yarn es snapshot and yarn start
2. Add some sample data
3. Navigate to Index Management and check index details flyout
4. To delete a document, first use GET /<index_name>/_search in Console and copy _id of any document in the hits array, then use DELETE /kibana_sample_data_ecommerce/_doc/<doc_id>?refresh=true to delete a document
5. Check that the value in the flyout is updated (NOTE: For some reason, the count for deleted docs is incremented by 2 for each deleted document. It has something to do with index refresh and changes if the index is flushed)

Screenshot

Checklist

• Unit or functional tests were updated or added to match the most common scenarios

Release Note

In Index Management app, index details again display previously missing values for the number of deleted documents and the primary storage size.

[elasticmachine]

Pinging @elastic/platform-deployment-management (Team:Deployment Management)

[yuliacech]

@elasticmachine merge upstream

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 94e2c94
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• Webpack Bundle Analyzer

Metrics [docs]

Public APIs missing comments

Total count of every public API that lacks a comment. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats comments for more detailed information.

id	before	after	diff
indexManagement	164	170	+6

Unknown metric groups

API count

id	before	after	diff
indexManagement	169	175	+6

History

• 💛 Build #21915 was flaky f00c6d8

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

[alisonelizabeth]

Changes LGTM. Verified locally. Thanks for fixing this!

[yuliacech]

Thanks a lot for the review, @alisonelizabeth!

[kibanamachine]

The following labels were identified as gaps in your version labels and will be added automatically:

• v8.2.0

If any of these should not be on your pull request, please manually remove them.

[kibanamachine]

💔 Some backports could not be created

Status	Branch	Result
❌	8.0	Backport failed because of merge conflicts You might need to backport the following PRs to 8.0: - [Index management] Prepare support Index template V2 format (#61588)
✅	8.1
❌	7.17	Backport failed because of merge conflicts

How to fix

Re-run the backport manually:

node scripts/backport --pr 124731

Note: Successful backport PRs will be merged automatically after passing CI.

Questions ?

Please refer to the Backport tool documentation

[yuliacech]

I'm removing 7.17.1 and 8.0.0 labels and won't backport the fix to those branches. The reason for that is this PR (remove _cat APIs) that was only backported to 8.1.0 and causes merge conflicts for 7.17 and 8.0 branches.