FSS how to know who is searching ?

(from github.com/buithehien1991)
Dear @marevol

In Fess site search widget, how to config to know who is searching? And I can’t see in search log when search in FSS. (Search in main page already have log in Search Log)

Please tell me way to know who is searching in FSS

Thank you and best regards,
Bui The Hien

(from github.com/marevol)
Added user_info in #1922.