es6.1快照备份失败 AccessDeniedException

{
    "error":{
        "root_cause":[
            {
                "type":"repository_verification_exception",
                "reason":"[0804] [[rpVpf6MBQui2Gz74olVirw, 'RemoteTransportException[[master1][192.168.1.45:9300][internal:admin/repository/verify]]; nested: RepositoryVerificationException[[0804] store location [/opt/backup] is not accessible on the node [{master1}{rpVpf6MBQui2Gz74olVirw}{yzXjPKizTmiyGj-ET-LliQ}{es1}{192.168.1.45:9300}]]; nested: AccessDeniedException[/opt/backup/tests-5jtFufh7QBa8ifbj8u3pBw/data-rpVpf6MBQui2Gz74olVirw.dat];']]"
            }
        ],
        "type":"repository_verification_exception",
        "reason":"[0804] [[rpVpf6MBQui2Gz74olVirw, 'RemoteTransportException[[master1][192.168.1.45:9300][internal:admin/repository/verify]]; nested: RepositoryVerificationException[[0804] store location [/opt/backup] is not accessible on the node [{master1}{rpVpf6MBQui2Gz74olVirw}{yzXjPKizTmiyGj-ET-LliQ}{es1}{192.168.1.45:9300}]]; nested: AccessDeniedException[/opt/backup/tests-5jtFufh7QBa8ifbj8u3pBw/data-rpVpf6MBQui2Gz74olVirw.dat];']]"
    },
    "status":500
}
 
报错如截图 但是此目录我已经设置777权限  属主属组也已经设置了正确的权限 切换到用户 尝试操作目录也成功 不知道是什么问题 各位大佬 救救孩子吧