[BUG] "Normal" index pattern syntax not allowed within "index_patterns" in ISM policies

[rpasche]

What is the bug?
When defining an index_pattern within an ISM policy, the "normal" index-pattern syntax is not allowed. The error

[index_management_exception] Validation failed: 1: index_pattern ]c0666_log-*,-*_remote] must not contain the following characters....

It is valid in opensearch to further adjust an index-pattern, like

GET _cat/indices/c0666_log-*,-*_remote,c0666_log-000077_remote

This shows all indices matching c0666_log-*, but removing anything from that list that matches -*_remote but then exceptionally re-adding the index c0666_log-000077_remote.

This pattern also works when creating index-patterns to be used in Discovery

How can one reproduce the bug?
Steps to reproduce the behavior:

1. Go to 'State management policies'
2. Create a new policy
3. Try to define a pattern like c0666_log-*,-*_remote
4. See error

What is the expected behavior?
That the same syntax for an index_pattern is allowed as well.

What is your host/environment?

• OS: Linux
• Opensearch version: 3.2.0
• Dashboards version: 3.2.0

Do you have any screenshots?

Do you have any additional context?
This is related to issue #1426. The proposed workaround (see #1426 (comment)) with an additional higher priority policy would not be needed in this case.

There is also #1427 which would use remote as a prefix instead of a suffix, which I would also appreciate.

[andrross]

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