View Access Role Members / Administrators only return 1000 users. There are more members than that.
Release : 14.x
Component : IdentityMinder(Identity Manager)
Limit on the User Directory itself.
The limit for this is enforced by the user store endpoint (ie CA Directory / AD etc).
For CA Directory, the limit can be changed by adjusting the max-op-size value in the relevant configuration file
set max-op-size = 10000;
For Active Directory, the limit can be changed by adjusting MaxPageSize (1000, by default) - as explained here
Launching NTDSUTIL.exe on your DC as explained above, the flow should be similar to this example - where the MaxPageSize was changed to 1234
We can see how post this change, number of users returned now is limited to our new MaxPageSize of 1234