Issue Summary

The old Internal Cache App API response to a DELETE operation.

DELETE /rest/internal/1.0/cache/app

The API was not intended to be used to flush all caches and was deemed not safe to be used in Production environment.

Suggested solution

1. Remove the internal API from being exposed in a Production environment
2. Provide alternative ways to flush User & Groups cache that is Production-safe

Workaround

For a cache flush event, perform a full restart. For DC, this means shutting down all nodes first then starting the nodes again.