The system index permissions check introduced via #2887 adds check for * and <prefix>*.

Access to all system indices is currently not allowed with *. A prefix is required to granted access to all system indices matching that prefix.

With <prefix>* pattern, access will be granted to all indices (including system indices) that begin with a dot ..

Currently all system indices reserved by plugins (see the list here) begin with a ., this would essentially make * pattern access control ineffective.

The goal of this issue is to seek votes whether to allow access to system indices with .* pattern.