[Xylakant]

well-behaved site plugins (such as kopf) have always been able to run as a standalone app in the browser - either from a folder on your disk of from a stupid webserver. All it needed was a working CORS config on the ES cluster.

It's always been a good idea to deploy them in that way - no need to have the plugin on each node, easier version upgrades, access to multiple clusters etc. So basically, not much changed.