Unresolved reference: addCriteria (Kotlin) I am trying to write some basic MongoDB custom queries in Kotlin. I've seen nearly everywhere that people use a method addCriteria: val query: Query = Query() query.addCriteria(Criteria.where("field1").exists(true))) But it seems there is no method addCriteria in Query which I use: org.springframework.data.mongodb.repository.Query I am very confused. Cannot find any explanations on how to write custom MongoDB queries in Kotlin with Spring Data except using this method.