However I have a self-hosted server with Elasticsearch 6.
Does it allow me to get an estimate of how many GB were read during a period and how many API calls were made in a period?
Elasticsearch 6 is very much EOL and no longer supported, you should be looking to upgrade as a matter of urgency.
There are some Monitoring components you can use as per Monitoring Elasticsearch | Elasticsearch Reference [6.0] | Elastic
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