WEF no hosts showing up in SIEM

I'm using WEF and upgraded to 7.8, loaded the new template, followed some suggestions and added host.name

    function process(event) {
              event.Put("host.name", event.Get("winlog.computer_name"));
            }

...but I still don't have any hosts showing up in the SIEM? The host.name field is definitely working...is there anything else I can try?

Thanks!

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