[syslog-ng] Forwarding to Elastic

I am running ES/Kibana 6.8.9-1 and am struggling with this issue. https://discuss.elastic.co/t/message-failed-to-find-message-in-kibana-logs/2... I have added my index to the *Logs Indices* field in the Logs configuration. When I look at the fields in a document I see a field called MESSAGE, but not message. I do not see a way to add this field in the configuration. Is it possible to have this document display in the Logs UI? Can I convert the fields in syslog-ng to lowercase before forwarding them to elastic? Thanks, Shawn