Mapping Not showing in Discover

[merlin_nunez1 (merlin nuñez)]

After upgrading our cluster from version 7.15 to 7.17, the discover module stopped showing all fields for our .net application logs.
We index all our .net application logs to indices named ui, and the mapping shows there:

But when I go to discover:

I tried deleting all indexes and let it re do the mapping by itsel but the results are the same.
Any ideas?

[matw (Matthias Wilhelm)]

Hi
What's your setting of "discover:searchFieldsFromSource" and if you configure it differently, do your fields show up?

Best,
Matthias