@Test
    void testDistributionBitCountConfigDecrease() throws Exception {
        FleetControllerOptions options = setUpSystem();
        var builder = FleetControllerOptions.Builder.copy(options);
        builder.setDistributionBits(12);
        fleetController().updateOptions(builder.build());
        waitForState("version:\\d+ bits:12 distributor:10 storage:10");
    }
Test that then altering config to decrease bit count, that a new system state is sent out with that bit count.
clustercontroller-core/src/test/java/com/yahoo/vespa/clustercontroller/core/DistributionBitCountTest.java