private void recordConfig(final AssignmentConfigs configuration) {
            history.append("Creating assignor with configuration: ")
                   .append(configuration)
                   .append('\n');
        }
Flip the cluster states from "assigned" to "subscribed" so they can be used for another round of assignments.
streams/src/test/java/org/apache/kafka/streams/processor/internals/assignment/TaskAssignorConvergenceTest.java