Initialization of Couchbase Bucket/Data/Index

What are the files that govern whether the intialization “Setup” screen is presented to the web interface or the currently loaded buckets are presented?

Some times, when doing testing, I trigger the couchbase server to return to the Welcome screen and the couchbase server then has a wizard the prompts for several pieces of information and creates a Default bucket.

But just a short while earlier, I had been experimenting with things and like caused a file change.

What are the controlling files, fields that trigger a couchbase server to present the “Welcome” screen on the 8091/18091 HTTP interfaces.

It’s essentially if the cluster/node has been initialized yet - either by stepping through the wizard, or using couchbase-cli cluster-init or the REST API to initialise the cluster and/or node.