Heap space is a parameter of the JVM, it applies to the elasticsearch node/instance
The recommendation is to set JVM heap to half the amount of RAM, but always below 32Gb:
JVM heap will be used for everything happening on that node, OOO applies to the entire process. If one node becomes unavailable following OOO, this applies to any action would do, and shards will be reallocated provided there are replicas available so other nodes would then be able to respond to indexing/searches
If elasticsearch runs out of memory, there are a few things to look out : add more memory if possible, add more nodes to scale horizontally, or reduce the amount of data in your cluster (or review mappings and queries/aggregations to reduce resource usage)
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