private void switchToNewConfig() {
        options = nextOptions;
        nextOptions = null;
        try {
            propagateOptions();
        } catch (Exception e) {
            context.log(logger, Level.SEVERE, "Failed to handle new fleet controller config", e);
        }
    }
This is called when the options field has been set to a new set of options
clustercontroller-core/src/main/java/com/yahoo/vespa/clustercontroller/core/FleetController.java