private void handleFeeding(Element spec, Tuning.SearchNode sn) {
        sn.feeding = new Tuning.SearchNode.Feeding();
        for (Element e : XML.getChildren(spec)) {
            if (equals("concurrency", e)) {
                sn.feeding.concurrency = asDouble(e);
            } else if (equals("niceness", e)) {
                sn.feeding.niceness = asDouble(e);
            }
        }
    }
Builder for the tuning config for a search cluster.

@author geirst
config-model/src/main/java/com/yahoo/vespa/model/builder/xml/dom/DomSearchTuningBuilder.java