public static Execution createExecutionObj(List<Searcher> searchers) {
        return new Execution(new Chain<>(searchers), Execution.Context.createContextStub());
    }
Create execution object based on searchers

@param searchers list of searchers to be added to the search chain
container-search/src/test/java/com/yahoo/search/query/rewrite/test/QueryRewriteSearcherTestUtils.java