Spring Cloud Stream demo app inspired by http://www.mokabyte.it/2018/10/microservizikafka/
List topics
kafka-topics.sh --bootstrap-server localhost:9092 --list
Produce messages to a topic
kafka-console-producer.sh --topic Stocks --bootstrap-server localhost:9092
Consume messages to a topic
kafka-console-consumer.sh --topic Quotes --from-beginning --bootstrap-server localhost:9092