https://docs.spring.io/spring-data/data-mongo/docs/current/api/org/springframework/data/mongodb/core/ReactiveMapReduceOperation.MapReduceWithMapFunction.html
ReactiveMapReduceOperation.MapReduceWithMapFunction (Spring Data MongoDB 5.0.5 API)
declaration: package: org.springframework.data.mongodb.core, interface: ReactiveMapReduceOperation, interface: MapReduceWithMapFunction
spring data mongodbapi