Content search is only accessible for global admin - should allow other users access to this excellent feature
Both for eDiscovery and the new Content Search - allow access to search for Users. Although i have added a user to the Discovery Management and eDiscovery Roles they cannot access Content Search unless the have Global Admin Role. This is a very useful tool which should be available to some users.
You don't have to be Global Admin, but you have to be an Exchange Admin in addition to the roles you listsed. There is also a separate permission to preview