代码：
List comments = commentDao.findAll();
findAll为继承自MongoRepository的方法
报错：
Caused by: com.mongodb.MongoQueryException: Query failed with error code 2 and error message 'Field 'locale' is invalid in: { locale: "comment" }' on server localhost:27017
at com.mongodb.operation.FindOperation$1.call(FindOperation.java:735)
at com.mongodb.operation.FindOperation$1.call(FindOperation.java:725)
at com.mongodb.operation.OperationHelper.withReadConnectionSource(OperationHelper.java:463)
at com.mongodb.operation.FindOperation.execute(FindOperation.java:725)
at com.mongodb.operation.FindOperation.execute(FindOperation.java:89)
at com.mongodb.client.internal.MongoClientDelegate$DelegateOperationExecutor.execute(MongoClientDelegate.java:189)
at com.mongodb.client.internal.MongoIterableImpl.execute(MongoIterableImpl.java:143)
at com.mongodb.client.internal.MongoIterableImpl.iterator(MongoIterableImpl.java:92)
at org.springframework.data.mongodb.core.MongoTemplate.executeFindMultiInternal(MongoTemplate.java:2793)
... 86 more
试过换工程、换数据库、换表、换版本，依旧没有解决，而且几乎搜不到这个错误。