@Override
        public Collection<ForkingSearcher.CommentedSearchChain> getSearchChainsForwarded(SearchChainRegistry registry) {
            return List.of(
                    new ForkingSearcher.CommentedSearchChain("Reason for forwarding to this search chain.", dummySearchChain()),
                    new ForkingSearcher.CommentedSearchChain(null, dummySearchChain()));
        }
A search chain consisting of two searchers.
@author bratseth
@author Tony Vaagenes
container-search/src/test/java/com/yahoo/search/searchchain/test/SimpleSearchChain.java