You're using the cloud service ("ESS"), not "ECE" (which is the framework on which ESS runs, which you can download and run on your own infrastructure). The docs you found are for ECE, and hence describe "framework level" operations, which are not available to ESS users.
Unfortunately in ESS you can't change the cname, it's hardwired to (eg) $region.aws.found.io (and the full URL is always that prefixed by the cluster id)
If you own a DNS service then you can set up a cname alias there (though recommended is to set up an nginx proxy for your services to hit)
Thank you, Alex.
I think is confusing the names "ESS" and "ECE" and the search of documentation.
By example, im working on setup ADFS, and all the docs point to ECE, not ESS.
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