[dev] Info on Search in Customer Panel

Hi guys, help me to understand how to manage the parameter Ticket::Frontend::CustomerTicketSearch###ExtendedSearchCondition Help contains information on: *Allows extended search conditions in ticket search of the customer interface. With this feature you can search w. g. with this kind of conditions like "(key1 && key2)" or "(key1 | | key2).* But where imposed the keys? Thanks Rocco