https://pekko.apache.org/japi/pekko/snapshot/org/apache/pekko/cluster/pubsub/DistributedPubSubMediator.GetTopics.html
DistributedPubSubMediator.GetTopics
declaration: package: org.apache.pekko.cluster.pubsub, class: DistributedPubSubMediator, class: GetTopics
gettopics