private static ChainSpecification emptySearchChainSpecification(String componentName) {
        return new ChainSpecification(new ComponentId(componentName),
                                      VespaSearchChainsCreator.inheritsVespaPhases(), //TODO: refactor
                                      List.of(),
                                      Set.of());
    }
Adds default search chains for all local clusters not mentioned explicitly
@author Tony Vaagenes
config-model/src/main/java/com/yahoo/vespa/model/container/search/searchchain/defaultsearchchains/LocalClustersCreator.java