code: public static Cluster getOrCreateCluster(String clusterName,
        CassandraHostConfigurator cassandraHostConfigurator) {
      return createCluster(clusterName, cassandraHostConfigurator, null);
    }
docs: Calls the three argument version with a null credentials map.
  {@link #getOrCreateCluster(String, me.prettyprint.cassandra.service.CassandraHostConfigurator, java.util.Map)}
  for details.