[BUG] ignore_unavailable query parameter not working on index operations

[IanMenendez]

Describe the bug

ignore_unavailable query parameter is not working on HEAD operation with indexes

Related component

Other

To Reproduce

PUT testing
{
  "mappings": {}
}

HEAD testing?ignore_unavailable=true

POST /testing/_close

HEAD testing?ignore_unavailable=true

I expect the last HEAD response to be a 404 (since ignore_unavailable = true. But 200 is returned)

As per docs: https://opensearch.org/docs/latest/api-reference/index-apis/exists/#query-parameters

ignore_unavailable: If true, OpenSearch does not search for missing or closed indexes. Default is false.

Expected behavior

Closed indexes should throw 404 on the HEAD operation when it's closed and query param ignore_unavailable=true is provided

Additional Details

No response