Documentation says we can protect a specific revision against deletion.
Question: how can we delete a specific revision (without any comments attached).
Policy revisions without a comment will be automatically overwritten. There is no way to manually delete them through the policy manager. You could alternatively lower the amount of allowed revisions which will overwrite revisions quicker.
By default we store 20 and this can be configured via the cluster property policyVersioning.maxRevisions
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