Add missing index permission

[derek-ho]

Description

Adds missing index permission indices:admin/opensearch/ism/managedindex

Category

Bug fix

Why these changes are required?

Fix issue: opensearch-project/security#4559

What is the old behavior before changes and new behavior after changes?

The permission will show up in the dropdown.

Issues Resolved

Fix: opensearch-project/security#4559

Testing

Manual testing

Check List

• New functionality includes testing
• New functionality has been documented
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.39%. Comparing base (b1148fb) to head (a60ba1c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2031   +/-   ##
=======================================
  Coverage   71.39%   71.39%           
=======================================
  Files          97       97           
  Lines        2650     2650           
  Branches      410      403    -7     
=======================================
  Hits         1892     1892           
  Misses        642      642           
  Partials      116      116           

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[cwperks]

Adding plugin permissions to this dropdown can cause unexpected experiences when trying to use functionality from plugins.

Generally, its recommended for plugin developers to create pre-defined roles where they can provide assurances that those roles will allow a mapped user the ability to use a plugin in an expected way.

I'm not opposed to adding individual plugin permissions to this dropdown, but I think it should be coupled with inline link to documentation for what APIs the action allows a mapped user to perform.