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on startup Optimize retrieves the elasticsearch version via Rest-API and check if this version is actually supported
Depending on the ES version Optimize has the following behaviour:
< 6.2: throw error message that ES version is not supported
6.2 - 6.5: everything is fine. No log output at all or maybe an info message that Optimize is communicating with ES version 6.X
> 6.5 but < 7.0: log warning that the version might work, but is not officially supported
>= 7.0: throw error message that ES version is not supported
if the version is not supported Optimize does not start
it is documented in the technical guide which versions are supported
it easy to add/remove supported versions for a new Optimize version

Do not start Optimize if the elasticsearch version does not match