Is sgadmin.sh backwards compatible, e.g. can I run a version designed for ES7 against an ES6 cluster?

Yes, sgadmin7 can talk to ES 6.7.x and 6.8.x (but not to 6.6.x or older - thats not because of Search Guard but because of comatibility of the wire/transport protocol)

Sgconfig on non-ES host

Search Guard

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Sgconfig on non-ES host

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