In the Roles tab of ArcGIS Server Manager, there is a Role search option. Any search string that you use in this field is used to compare against the role name. Our roles are populated from Active Directory so the majority of these roles (less than 1%) are not used by us in ArcGIS Server. To find a role to assign to a new user, it would be much easier to search by role type for roles such as Publisher or Administrator. Or if I am asked by an IT auditor who has access to perform specific functions within ArcGIS Server, I need to know who has the role types that perform that function. I do not know what roles may have been given access in the past without scrolling through at least 1000 different roles. Portal for ArcGIS has the ability to filter a member list by specific roles and user types. This is a very similar function that does not exist in ArcGIS Server.
