@Override
    protected Searcher<ChainedComponentModel> doBuild(DeployState deployState, TreeConfigProducer<AnyConfigProducer> ancestor, Element searcherElement) {
        ChainedComponentModelBuilder modelBuilder = new ChainedComponentModelBuilder(searcherElement);
        return new Searcher<>(modelBuilder.build());
    }
Builds a Searcher from XML.
@author Tony Vaagenes
config-model/src/main/java/com/yahoo/vespa/model/builder/xml/dom/chains/search/DomSearcherBuilder.java