private static DeploymentResult toDeploymentResult(HttpResponse<byte[]> response) {
        Inspector rootObject = toInspector(response);
        return new DeploymentResult(rootObject.field("message").asString(),
                                    rootObject.field("run").asLong());
    }
Returns the "message" element contained in the JSON formatted response.
hosted-api/src/main/java/ai/vespa/hosted/api/ControllerHttpClient.java