Deprecate mapReduce.

Closes: #3945

Author: christophstrobl

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/MongoOperations.java

@@ -566,7 +566,7 @@ public <T> T execute(SessionCallback<T> action, Consumer<ClientSession> onComple
 	 * @param reduceFunction The JavaScript reduce function
 	 * @param entityClass The parametrized type of the returned list. Must not be {@literal null}.
 	 * @return The results of the map reduce operation
-	 * @deprecated since MongoDB server version 5.0
+	 * @deprecated since 3.4 in favor of {@link #aggregate(TypedAggregation, Class)}.
 	 */
 	@Deprecated
 	<T> MapReduceResults<T> mapReduce(String inputCollectionName, String mapFunction, String reduceFunction,
@@ -581,7 +581,7 @@ <T> MapReduceResults<T> mapReduce(String inputCollectionName, String mapFunction
 	 * @param mapReduceOptions Options that specify detailed map-reduce behavior.
 	 * @param entityClass The parametrized type of the returned list. Must not be {@literal null}.
 	 * @return The results of the map reduce operation
-	 * @deprecated since MongoDB server version 5.0
+	 * @deprecated since 3.4 in favor of {@link #aggregate(TypedAggregation, Class)}.
 	 */
 	@Deprecated
 	<T> MapReduceResults<T> mapReduce(String inputCollectionName, String mapFunction, String reduceFunction,
@@ -597,7 +597,7 @@ <T> MapReduceResults<T> mapReduce(String inputCollectionName, String mapFunction
 	 * @param reduceFunction The JavaScript reduce function
 	 * @param entityClass The parametrized type of the returned list. Must not be {@literal null}.
 	 * @return The results of the map reduce operation
-	 * @deprecated since MongoDB server version 5.0
+	 * @deprecated since 3.4 in favor of {@link #aggregate(TypedAggregation, Class)}.
 	 */
 	@Deprecated
 	<T> MapReduceResults<T> mapReduce(Query query, String inputCollectionName, String mapFunction, String reduceFunction,
@@ -613,7 +613,7 @@ <T> MapReduceResults<T> mapReduce(Query query, String inputCollectionName, Strin
 	 * @param mapReduceOptions Options that specify detailed map-reduce behavior
 	 * @param entityClass The parametrized type of the returned list. Must not be {@literal null}.
 	 * @return The results of the map reduce operation
-	 * @deprecated since MongoDB server version 5.0
+	 * @deprecated since 3.4 in favor of {@link #aggregate(TypedAggregation, Class)}.
 	 */
 	@Deprecated
 	<T> MapReduceResults<T> mapReduce(Query query, String inputCollectionName, String mapFunction, String reduceFunction,

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/MongoTemplate.java

@@ -1661,7 +1661,9 @@ public <T> MapReduceResults<T> mapReduce(Query query, String inputCollectionName
 	 * @param resultType
 	 * @return
 	 * @since 2.1
+	 * @deprecated since 3.4 in favor of {@link #aggregate(TypedAggregation, Class)}.
 	 */
+	@Deprecated
 	public <T> List<T> mapReduce(Query query, Class<?> domainType, String inputCollectionName, String mapFunction,
 			String reduceFunction, @Nullable MapReduceOptions mapReduceOptions, Class<T> resultType) {
 

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/ReactiveMongoOperations.java

@@ -1505,7 +1505,7 @@ <T> Flux<ChangeStreamEvent<T>> changeStream(@Nullable String database, @Nullable
 	 * @param options additional options like output collection. Must not be {@literal null}.
 	 * @return a {@link Flux} emitting the result document sequence. Never {@literal null}.
 	 * @since 2.1
-	 * @deprecated since MongoDB server version 5.0
+	 * @deprecated since 3.4 in favor of {@link #aggregate(TypedAggregation, Class)}.
 	 */
 	@Deprecated
 	<T> Flux<T> mapReduce(Query filterQuery, Class<?> domainType, Class<T> resultType, String mapFunction,
@@ -1525,7 +1525,7 @@ <T> Flux<T> mapReduce(Query filterQuery, Class<?> domainType, Class<T> resultTyp
 	 * @param options additional options like output collection. Must not be {@literal null}.
 	 * @return a {@link Flux} emitting the result document sequence. Never {@literal null}.
 	 * @since 2.1
-	 * @deprecated since MongoDB server version 5.0
+	 * @deprecated since 3.4 in favor of {@link #aggregate(TypedAggregation, Class)}.
 	 */
 	@Deprecated
 	<T> Flux<T> mapReduce(Query filterQuery, Class<?> domainType, String inputCollectionName, Class<T> resultType,

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/mapreduce/MapReduceCounts.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2021 the original author or authors.
+ * Copyright 2010-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,7 +20,7 @@
  *
  * @author Mark Pollack
  * @author Oliver Gierke
- * @deprecated since MongoDB server version 5.0
+ * @deprecated since 3.4 in favor of {@link org.springframework.data.mongodb.core.aggregation}.
  */
 @Deprecated
 public class MapReduceCounts {

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/mapreduce/MapReduceOptions.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2021 the original author or authors.
+ * Copyright 2010-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -30,7 +30,7 @@
  * @author Oliver Gierke
  * @author Christoph Strobl
  * @author Mark Paluch
- * @deprecated since MongoDB server version 5.0
+ * @deprecated since 3.4 in favor of {@link org.springframework.data.mongodb.core.aggregation}.
  */
 @Deprecated
 public class MapReduceOptions {

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/mapreduce/MapReduceResults.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2021 the original author or authors.
+ * Copyright 2011-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -30,7 +30,7 @@
  * @author Christoph Strobl
  * @author Mark Paluch
  * @param <T> The class in which the results are mapped onto, accessible via an iterator.
- * @deprecated since MongoDB server version 5.0
+ * @deprecated since 3.4 in favor of {@link org.springframework.data.mongodb.core.aggregation}.
  */
 @Deprecated
 public class MapReduceResults<T> implements Iterable<T> {

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/mapreduce/MapReduceTiming.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2021 the original author or authors.
+ * Copyright 2010-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,8 +16,7 @@
 package org.springframework.data.mongodb.core.mapreduce;
 
 /**
- * @deprecated since MongoDB server version 5.0
- *
+ * @deprecated since 3.4 in favor of {@link org.springframework.data.mongodb.core.aggregation}.
  */
 @Deprecated
 public class MapReduceTiming {