Data not being processed

We have an elasticsearch to Grafana setup. In Explore, we can see data is coming through, and if we query for answers, it reports how many times it was seen, however the details are not there. I cannot see the field names that Grafana sees.
In the dashboards I have created, all of the field names match those in Elasticsearch.

This data is log text data, from a proprietary device, all the fields are custom.