异常信息:MongoDB.Driver.MongoCommandException: Command find failed: Executor error during find command :: caused by :: Sort operation used more than the maximum 33554432 bytes of RAM. Add an index, or specify a smaller limit..
解决办法:对条件字段 加索引
db.你的collection.createIndex({"你的字段": -1}),此处 -1 代表倒序,1 代表正序;
db.你的collecton.getIndexes();