public void stop() {
        if (stopped) return;
        stop(false);
    }
This class manages the coordination process with brokers for the Connect cluster group membership. It ties together
the Coordinator, which implements the group member protocol, with all the other pieces needed to drive the connection
to the group coordinator broker. This isolates all the networking to a single thread managed by this class, with
higher level operations in response to group membership events being handled by the herder.
connect/runtime/src/main/java/org/apache/kafka/connect/runtime/distributed/WorkerGroupMember.java