public Map<String, Optional<TopicDescription>> describeTopics(String... topicNames) {
        return describeTopics(new HashSet<>(Arrays.asList(topicNames)));
    }
Get the topic descriptions of the named topics. The value of the map entry will be empty
if the topic does not exist.

@param topicNames the names of the topics to describe
@return the map of optional {@link TopicDescription} keyed by the topic name
connect/runtime/src/test/java/org/apache/kafka/connect/util/clusters/EmbeddedKafkaCluster.java