public Map<String, KafkaFuture<Void>> topicNameValues() {
        return nameFutures;
    }
Use when {@link Admin#deleteTopics(TopicCollection, DeleteTopicsOptions)} used a TopicNameCollection
@return a map from topic names to futures which can be used to check the status of
individual deletions if the deleteTopics request used topic names. Otherwise return null.
clients/src/main/java/org/apache/kafka/clients/admin/DeleteTopicsResult.java