Hey Tim, Dremio doesn’t yet support 6.x, so that may be the issue here.
https://docs.dremio.com/data-sources/elasticsearch.html
Any chance you can try the same on 5.x? We won’t have 6.x until later this year.
What you’re trying to do normally works fine.
Hopefully you get the chance to experiment with Reflections, they can make a big performance difference. 