Consider the following situation: the node has 100 GB of RAM, but the ES heap size is 30 GB.
Does this mean that ES will only ever use 30 GB of RAM? And the other 70 GB will go unused?
If not, than what how does it use the memory.
P.S. I see lots of articles on setting the correct size of the heap, but can't find anything that describes what it is and how it works in relation to ES.