Elasticsearch Ram recommendation

I'm deploying an Elasticsearch cluster with roughly 40GB a day with a time-to-live of 365 days. Write speed would be around 50 msgs/sec. Reads would be mostly driven by user dashboards, so the read frequency won't be high. What would be the best hardware requirements for this amount of data? How many master and data nodes may require in this situation?

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I would start with 3 nodes of 8-16GB of RAM, and 4TB of disk space and then expand when they start to fill up.

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