Create compound wildcard index when running with MongoDB >= 7.0

[thjaeckle]

MongDB 7.0 adds support for compound wildcard indexes.
This can be utilized for the Ditto search index in the way that e.g. the namespace (being part of the top level search index) may be used in combination with the wildcard index.

Or even the global reads..

That should be a great option to optimize query performance when specifying a namespace, doing search queries.