private static List<ClusterDef> parse(ClusterListConfig config) {
        return config.storage().stream()
                     .map(storage -> new ClusterDef(storage.name()))
                     .toList();
    }
A list of content clusters, either obtained from a list, a given config or by self-subscribing
vespaclient-core/src/main/java/com/yahoo/vespaclient/ClusterList.java