我正在使用来自Java的Mongodb。我像这样创建一个集合和一个索引:collection=mongoClient.getDB(DB_NAME).getCollection(COLLECTION_NAME)collection.ensureIndex(newBasicDBObject(['customerReference':1,'unique':true]))当我检查mongoshell时，我看到:{"v":1,"key":{"customerReference":1,"unique":true},"ns":"diagnostics.diagnosticData","name":"