mongodump 报错:errmsg: "Auth mechanism not specified
mongodump报错assertion:2{ok:0.0,errmsg:"Authmechanismnotspecified",code:2,codeName:"BadValue",operationTime:Timestamp1573815888000|1,$clusterTime:{clusterTime:Timestamp1573815888000|1,原因mongodump版本较低导致的