Thank you Erel.
I logged the "search" event with the standard parameters "search_term". In the console I can see the "search" event, but I can't see the parameter. This is a limit of firebase console as reported here:
https://groups.google.com/forum/#!topic/firebase-talk/W9w-YKkW4fc
Here you can read: "Currently,
not all suggested events provide parameter reporting, but we aim to add parameter reporting to all of them. In the meantime, your best options for viewing parameter reporting on these is to either use a different event (like select_content) or to view your data in BigQuery."
I'll try the event "select_content"...
Bye