public WorkerLoad build() {
                return new WorkerLoad(
                        withWorker,
                        withConnectors != null ? withConnectors : new ArrayList<>(),
                        withTasks != null ? withTasks : new ArrayList<>());
            }
Get the version of the connect protocol that is currently active in the group of workers.

@return the current connect protocol version
connect/runtime/src/main/java/org/apache/kafka/connect/runtime/distributed/WorkerCoordinator.java