Hey all,

we regularly (several times a week) get longish GCs (20s or more) due to 
promotion failures.

>From what I understand this type of major GC is caused by fragmentation of 
the heap.

So I'm wondering:

1. What is all the stuff ES puts into the heap that ends up in the Old Gen?
2. Are there any recommended strategies for dealing with this specific kind 
of problem.

For example, would allowing more filter caching help or cause even more 
problems? And so on.

To give a little more info on our usage, we're read heavy, nearly entirely 
filter operations. Our heap is at ~10g. nearly all of which is used by the 
Old Gen (until a major GC runs).

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