public static String getDirectRouteName(String configId) {
        return configId + "-direct";
    }
This class is responsible for generating all hops and routes for the Document protocol running on message bus. All
the code within could really be part of {@link Routing}, but it has been partitioned out to allow better readability
and also more easily maintainable as the number of protocols increase.

@author Simon Thoresen Hult
config-model/src/main/java/com/yahoo/vespa/model/routing/DocumentProtocol.java