Suggestion on elastic cluster requirement

I have GKE clusters in that I am getting total 50MB logs /second to elastic and for this I have setup a 6 node elastic cluster with 4core and 16GB RAM configuration still I am facing issue when a surge occurs however my GVM memory usage is utilizing 81% avg and as per the by default conf for JVM it is taking 50% memory i.e 8GB, and I am using 8.6version so i need a suggestion that how many nodes of cluster I need and the machine conf as well so that i can achieve a reliable and highly available environment .
Plz suggest me

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