public Errors error() {
        return Errors.forCode(data.errorCode());
    }
Possible error code:
 - {@link Errors#STALE_CONTROLLER_EPOCH}
 - {@link Errors#STALE_BROKER_EPOCH}
 - {@link Errors#FENCED_LEADER_EPOCH}
 - {@link Errors#KAFKA_STORAGE_ERROR}
clients/src/main/java/org/apache/kafka/common/requests/StopReplicaResponse.java