我正在使用MongoDB-Hadoop连接器读取具有嵌入式文档的集合。JSON集合:PersonaMetaData{"user_id":NumberLong(2),"persona_created":true,"persona_createdAt":ISODate("2016-02-24T06:41:49.761Z"),"persona":[{"persona_type":1,"created_using_algo":"Nameofthealgo","version_algo":"1.0","createdAt":ISODate("2016-02-24T06:41:49.761Z"),