es.http.cname_in_publish_address deprecation warning emitted even if not set #47436
Description
In #45616 we added a deprecation warning to encourage users to remove the es.http.cname_in_publish_address property that we added to support BWC across a 6.x/7.x upgrade. However this warning is emitted whenever es.http.cname_in_publish_address is true, which is the default, so it's emitted even if the property is unset.
Relates https://discuss.elastic.co/t/deprecation-warnings-since-the-upgrade-to-7-4-0/201917/3