Editing OpenSearch Cluster Installation (section)

=== <code>jvm.options</code> ===
Set the heap size.  Common practice is that the heap should be between 4GB and half the available memory, but no higher than 32GB.  A minimum configuration might be (assuming the hot data nodes have 32GB installed RAM:

* 4G for master and cold data nodes
* 16G for hot data nodes

This must be done individually for each node -- create the file <code>config/jvm.options.d/heapsize.options</code> with the heap size options:
 -Xms4g
 -Xmx4g
... with, of course, the proper heap size for that node.