It has been a while since the original library https://github.com/lightbend/kafka-streams-query was developed and has added some great functionality there that we are looking to continue using.
Since Kafka has now moved to 2.x or more specifically 2.2.0, this library would need to be updated to continue the support, there is an open PR at the moment but no love on this project recently. FYI: https://github.com/lightbend/kafka-streams-query/pull/14
What is the best way to move forward? The fix is minimal, so should be easy to adopt.