What are the rough criteria for having dedicated masternodes in elasticsearch?

We know that having dedicated masternodes is good for stability and resource management.
In a relatively small scale, there are many cases where it seems that there is no need to have a dedicated master node.
Can you give me a document or content that has criteria for having a dedicated master node, even roughly?
Or let me know from your experience.

If you have a cluster into the tens of nodes, then it's probably worth having.
If you have a small cluster with a high volume of searches, even with low data volumes, then it's probably worth having.

There's no hard criteria here and it's all relative to your data size, your cluster size and your risk level.

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