Thanks for your reply!
Well you are true it wasn't so fine explained.
In the Client (I use psi) in discovery service, i can see the "User Search, I i make search I have no result withot full jid or using wildcard.
In the Admin console : User & Groups Tabs, I have "Search a user" on the left frame. I works but no wildcards are enable, you must enter the good and complete jid.
I think, "search plugins" have added a new "Advanced User Search".. It accept wildcards.. but it doesn't give any result also with the good jid.
Any action I mention here did result in any change on my openfire log files..!!