@SafeVarargs
    static List<Result> await(CompletableFuture<Result>... promises) throws MultiFeedException {
        return Helper.await(promises);
    }
Same as {@link #await(List)} except {@code promises} parameter is a vararg
@see #await(List)
vespa-feed-client-api/src/main/java/ai/vespa/feed/client/FeedClient.java