@Override
    public String toString() {
        return "CoordinatorResult(records=" + records +
            ", response=" + response +
            ", appendFuture=" + appendFuture +
            ", replayRecords=" + replayRecords +
            ", isAtomic=" + isAtomic +
            ")";
    }
@return Whether the result is atomic is not.
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/runtime/CoordinatorResult.java