SB Webflux Kafka - insufficient API doc.

The Docs to Kafka, present here:
https://github.com/snowdrop/vertx-spring-boot/tree/master/vertx-spring-boot-starter-kafka
does not cover replaying passed messages - which is one of the important Kafka features.

I tried to figure it out myself using KafkaConsumer methods I found like .seekToBeginning and .position - no luck with it.
Also I have no idea how to work with Kafka Partitions, which seems to be important for this.