@Override
    public FederationOptions federationOptions() {
        FederationOptions defaultOptions = new FederationOptions().setUseByDefault(useByDefault());
        return federationOptions.inherit(defaultOptions);
    }
A search chain that is intended to be used for federation (i.e. providers, sources)

@author Tony Vaagenes
config-model/src/main/java/com/yahoo/vespa/model/container/search/searchchain/GenericTarget.java