public KafkaFuture<Collection<TransactionListing>> all() {
        return allByBrokerId().thenApply(map -> {
            List<TransactionListing> allListings = new ArrayList<>();
            for (Collection<TransactionListing> listings : map.values()) {
                allListings.addAll(listings);
            }
            return allListings;
        });
    }
Get all transaction listings. If any of the underlying requests fail, then the future
returned from this method will also fail with the first encountered error.

@return A future containing the collection of transaction listings. The future completes
        when all transaction listings are available and fails after any non-retriable error.
clients/src/main/java/org/apache/kafka/clients/admin/ListTransactionsResult.java