Introduced explicit index resolution API

[nibix]

Description

These are the very high level changes for using the new interface from nibix/OpenSearch#1 in the security plugin.

Note: This far from complete, it does not even compile. It is only meant to give a sneak-peak.

• Category (Enhancement, New feature, Bug fix, Test fix, Refactoring, Maintenance, Documentation)
• Why these changes are required?
• What is the old behavior before changes and new behavior after changes?

Issues Resolved

[List any issues this PR will resolve]

Is this a backport? If so, please add backport PR # and/or commits #, and remove backport-failed label from the original PR.

Do these changes introduce new permission(s) to be displayed in the static dropdown on the front-end? If so, please open a draft PR in the security dashboards plugin and link the draft PR here

Testing

[Please provide details of testing done: unit testing, integration testing and manual testing]

Check List

• New functionality includes testing
• New functionality has been documented
• New Roles/Permissions have a corresponding security dashboards plugin PR
• API changes companion pull request created
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[nibix]

Ah, sorry, that was actually supposed to go to my own repo.