I have been asked several times whether the value filled in cc.spec.common.es.externalElasticsearchUrl requires an http prefix, but it is actually not needed, but this key is a bit confusing. I don’t know if I need an http prefix sometimes when I look at it, so I think it’s clearer to change it to externalElasticsearchUrl to externalElasticsearchHost

/kind feature-request

Summary

When we print the command help, we should automatically show the environment variables that the command supports. I expect that Usagef is probably the right API for this and that we will want a custom template.

Here's a sample of the default table output:

KEY