Field data and caches report as very small, but there is the 247MB in this case in GC so I'm wondering what is causing bloat there. If I leave them running without resizing for a few days they'll be around ~95% and ES starts responding with timeouts etc.
Maybe I really do need more memory for the load, but it's unclear (to me) what the reason is for holding whatever is in GC in memory. I'm enabling doc_values on more fields to see if that helps much as well, it seems to but it continues to ramp up to ~90-95%.
As far as creating dumps go I'm probably screwed with AWS hosting it haha.