private static SearchChain createNative() {
        SearchChain nativeChain = new SearchChain(nativeSearchChainSpecification());
        addInnerSearchers(nativeChain, VespaSearchers.nativeSearcherModels);
        return nativeChain;
    }
Creates the search chains vespaPhases, vespa and native.

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