private static void assertReindexingConfigPresent(VespaModel model) {
        ReindexingConfig reindexingConfig = model.getConfig(ReindexingConfig.class, "admin/cluster-controllers/0");
        assertTrue(reindexingConfig.enabled());
        assertEquals(1, reindexingConfig.clusters().size());
        String contentClusterId = "bar";
        assertEquals(Instant.EPOCH.toEpochMilli(), reindexingConfig.clusters(contentClusterId).documentTypes("type1").readyAtMillis());
        assertEquals(1.0, reindexingConfig.clusters(contentClusterId).documentTypes("type1").speed(), 0);
    }
Test for creating cluster controllers under the admin tag.
config-model/src/test/java/com/yahoo/vespa/model/admin/ClusterControllerTestCase.java