I have the following code that I use to apply JSONSchema validation each time my application is started:

 command := map[string]interface{}
 command["collMod"] = collectionName
 command["validator"] = schema
 command["validationLevel"] = "strict"
 ctx, cancel := context.WithTimeout(context.Background(), 5 * time.Second)
 defer cancel()
 err := DB.RunCommand(ctx, command).Err()

"schema" is JSON of the following form that is Unmarshaled into a map[string]interface{}

{
 "$jsonSchema" : {
 "bsonType" : "object"
 }
}

This frequently succeeds but I randomly get the following error

(CommandNotFound) no such command: 'validator', bad cmd: '{ validator: { $jsonSchema:

}, validationLevel: "strict", collMod: "user", $db: "ck", $readPreference: { mode: "primaryPreferred" } }'

I suspect that this is the same thing that pymongo users have encountered. And I learn that Go intentionally randomizes map[] order, so this seems plausible, but I also notice that RunCommand is used throughout the driver's testing and benchmarking code. It seems like the same issue would have come up for the project developers too.