/actuator/health returns 404 if no indicator is present

[snicoll]

An application with no custom HealthIndicator and management.health.defaults.enabled=false will return a 404. It used to be a 200 in 2.1.x:

HTTP/1.1 200
Content-Type: application/vnd.spring-boot.actuator.v2+json;charset=UTF-8
Date: Sat, 02 Nov 2019 07:06:31 GMT
Transfer-Encoding: chunked

{
    "details": {
        "application": {
            "status": "UP"
        }
    },
    "status": "UP"
}

[snicoll]

This has been discussed in #18676 but I don't understand the rationale of disabling the endpoint altogether if there are no indicators at all.

[snicoll]

We've discussed what we wanted to do and I've requalified the original issue.

Duplicate of #18676