public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("ContentCluster(").append(clusterName).append(") {");
        for (NodeInfo node : clusterInfo.getAllNodeInfos()) {
            sb.append("\n  ").append(node);
        }
        sb.append("\n}");
        return sb.toString();
    }
Returns the configured nodes of this as a read-only map indexed on node index (distribution key)
clustercontroller-core/src/main/java/com/yahoo/vespa/clustercontroller/core/ContentCluster.java