[BUG] Read only users see "[security_exception] no permissions" when looking at index patterns that point to no indices

[jhenley-icr-team]

Describe the bug

Currently we have many read only users who will occasionally run into a bug where if they open an index pattern that points to no indices they see the below error

Error fetching fields for index pattern cognos1291_test_datasource_scripted_pattern (ID: cognos1291_test_datasource_scripted_pattern)

[object Object]: [security_exception] no permissions for [indices:data/read/field_caps] and User [name=/cn=cognos base user, ou=integration, o=cognos, l=aurora, st=colorado]

This causes confusion for users as it gives them the impression they cannot see the info, not that there is no data.

Related component

No response

To Reproduce

1. Create an index pattern that points to no indices (easiest way to force it is to create an index pattern pointing at an index which is then deleted)
2. As a user with read only permissions
3. Go to Dashboards Management, select the created index pattern above
4. See error like below image

Expected behavior

Would expect that for a read only user that they would also see the same much more descriptive error that a user with read and write can see

Additional Details

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• OS: [e.g. iOS]
• Version [e.g. 22]

Additional context
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[andrross]

This looks like logic related to authorization, so it probably belongs in the security repository.

@opensearch-project/admin Can you transfer this to the security repo?

[cwperks]

[Triage] Thank you for filing this issue @jhenley-icr-team w/ reproduction steps. Marking this issue as triaged, I am not familiar with the field capabilities call that dashboards is making here and how the index resolution works for that call. I will take a deeper look at this to understand what indices are being resolved to.