private static SearchChain createVespa() {
        SearchChain vespaChain = new SearchChain(vespaSearchChainSpecification());
        addInnerSearchers(vespaChain, VespaSearchers.vespaSearcherModels);
        return vespaChain;
    }
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