@Evjl's Rain and
@BoraMurdar thank you again for your help.
Search is persisting and it's not going away, that's ok i can live with it but i don't like that it's using more than 30 mb of ram for no reason.
As for Evjl's way i think Microsoft has realased a patch to disable this option.
@BoraMurdar after restart Cortana is still in Task manager.
As i said i can leave with it.
Thank you both again for your help
Edit: after a few minutes Cortana is gone
go figure