MongoServerError: cannot index parallel arrays [certifications] [skills] If you've never hit this error, your schemas have been lucky. A team once brought me a document shaped like this during a design review: { _id : 1 , name : " engineer-42 " , skills : [ " mongodb " , " cassandra " , " python...
Source: [Dev.to](https://dev.to/saqibameen86/cannot-index-parallel-arrays-the-mongodb-error-that-improves-your-schema-4pp)