How to calculate number of data node requirement in a cluster

Elastic Stack Elasticsearch
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How to calculate number of data only node required in a cluster.  Calculating it in terms of number of shards, indexes or size of shards, indexes.

Can any give some pointer or limits that provides pointer to add more data only nodes to the cluster.

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May I suggest you look at the following resources about sizing:

https://www.elastic.co/elasticon/conf/2016/sf/quantitative-cluster-sizing

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