static <K, V> List<V> getOrCreateListValue(Map<K, List<V>> map, K key) {
        return map.computeIfAbsent(key, k -> new LinkedList<>());
    }
Get or create a list value from a map.

@param map   The map to get or create the element from.
@param key   The key.
@param <K>   The key type.
@param <V>   The value type.
@return      The list value.
clients/src/main/java/org/apache/kafka/clients/admin/KafkaAdminClient.java