Elasticsearch requirements for multiple Zammad Servers

I will be deploying a few Zammad instances using VMs, however, I’m looking to get some clarification when it comes to the Elasticsearch component. It is my understanding that a minimum install for Elasticsearch is 4GB with a more robust system using 6GB; would I be correct in stating I would just multiply the required memory by the number of Zammad instances that will be backed by the Elasticsearch instance? If not, is there a rule of thumb or something similar for this?

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