private int[] getConfigServerZookeeperIds() {
        return Optional.of(options.configServerZookeeperIds())
                .filter(ids -> ids.length > 0)
                .orElseGet(() -> IntStream.range(0, getConfigServers().length).toArray());
    }
Represents a config server cluster.

@author Ulf Lilleengen
config-model/src/main/java/com/yahoo/vespa/model/container/configserver/ConfigserverCluster.java