Trying to identify high heap memory usage (v1.7.5)

Elastic Stack Elasticsearch
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I have 14gb allocated to elasticsearch v1.7.5.

Heap Used is at 11.7gb, I cannot find what is using up all this memory w/ the nodes/stats below.

Here are the memory related items I can identify, which account for ~4gb, leaving 7gb unaccounted.

Filter Cache Memory: 35mb
Field Data Memory: 20mb
Segment Memory: 2.7gb
Index Writer Max Memory: 1.4gb

Any ideas on how to identify what is taking up the heap space?

Node Stats : https://gist.github.com/darinhoward/8ee35cc218f11cd4a9326920f7c857fc

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Similar to this question - Where is my heap going? that doesn't have a proper resolution. The goal is to find a way to spec out memory requirements for a cluster.

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