What is the best approach or way to investigate why heap usage is so high? I'm watching the node stats and I can see the fielddata and filter cache which I understand are a part of the heap, but if those two are low, no indexing is currently being done and heap is still high, where should I be looking?
Another thing I tried is getting the
hot_threads, but I'm not sure what to make of it:
Is there a way to get a snapshot of whats currently in the heap in a human readable way?