add placeholder for search2 legacy config
add placeholder for search2 legacy config

kbase/kbase-ui,eapearson/kbase-ui,kbase/kbase-ui,eapearson/kbase-ui,eapearson/kbase-ui,kbase/kbase-ui,kbase/kbase-ui,eapearson/kbase-ui,kbase/kbase-ui,eapearson/kbase-ui