Hmm I can't see a way to get this error message in any of the 7.9.x versions. Can you share the output of GET /_cat/nodes?h=n,v to verify exactly which version(s) you are using?
You said you were using 7.9 but this tells us you are using 7.7.0, in which the delete snapshot API is different -- see the docs at the bottom of Take a snapshot of one or more indices | Elasticsearch Reference [7.7] | Elastic and note that there's nothing to indicate DELETE /_snapshot/esbackup-elk-prod/20200124031645,20200125031645 should work in this version.
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