auto backup job completed，mysql operator container have error log

[qianfen2021]

Describe the problem
auto backup job completed，mysql operator container have error log。the error log info as follow：

2022-08-22T14:29:00.000+0800 ERROR controller-runtime.manager.controller.mysqlcluster.controllers.backupCronJob failed getting backups {"reconciler group": "mysql.radondb.com", "reconciler kind": "MysqlCluster", "name": "sample", "namespace": "default", "selector": {"LabelSelector":[{},{}],"FieldSelector":{},"Namespace":"default","Limit":0,"Continue":"","Raw":null}, "error": "Index with name field:status.completed does not exist"}
github.com/radondb/radondb-mysql-kubernetes/backup.(*CronJob).Run
/workspace/backup/cronbackup.go:44
github.com/wgliang/cron.(*Cron).runWithRecovery

To Reproduce

1.create mysql cluster
2.auto nfs backup job，the parameter configuration:

nfsServerAddress: "10.96.99.232"
 backupSchedule: "0 10 * * * *"

Expected behavior

Environment:

• RadonDB MySQL version:2.2.1

[acekingke]

Because the recurrent: "true" is missing