What is the recommended resource allocation? Obviously that varies a lot dependent on a huge number of factors, but there are ballpark estimations for the other types of node (4 gigs of RAM a core etc).
Start with 4GB RAM, 2-4 cores.
You don't need much disk space, just enough for the OS and install.
You can run >50% heap for these, as there is no off heap file caching that Elasticsearch would leverage. I wouldn't go >75% though.
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