private ContentCluster getIllegalGroupsCluster() throws Exception {
        return createCluster(createClusterXml(getOddGroupsClusterXml(), Optional.of(getRoundRobinDispatchXml()), 4, 4));
    }
Unit tests for hierarchic distribution in an indexed content cluster.

@author geirst
config-model/src/test/java/com/yahoo/vespa/model/content/IndexedHierarchicDistributionTest.java