Add index mode in resolve index response.

[seanzatzdev]

This PR updates the resolve index response specification to include the mode field, representing the index mode of the corresponding index. This is a follow up from elastic/elasticsearch#132858

➜  elasticsearch-specification git:(resolved-index-includes-mode) ✗ make validate api=indices.resolve_index type=response branch=main
Validating endpoints
Validating 1 API: indices.resolve_index
Validating responses

indices.resolve_index response has been successfully validated!
✔ 9 out of 9 test response cases are passing for indices.resolve_index.


> [email protected] lint
> eslint

[github-actions]

Following you can find the validation changes against the target branch for the APIs.

No changes detected.

You can validate these APIs yourself by using the make validate target.