DATAMONGO-2065 - Make sure that MongoTemplate.doSave(…) triggers overridable property population.

We now consistently call MongoTemplate.populateIdIfNecessary(…) to allow subclasses to override these calls.

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

@@ -1397,7 +1397,7 @@ public class MongoTemplate implements MongoOperations, ApplicationContextAware,
 		maybeEmitEvent(new BeforeSaveEvent<>(objectToSave, dbDoc, collectionName));
 		Object id = saveDocument(collectionName, dbDoc, objectToSave.getClass());
 
-		T saved = entity.populateIdIfNecessary(id);
+		T saved = populateIdIfNecessary(entity.getBean(), id);
 		maybeEmitEvent(new AfterSaveEvent<>(saved, dbDoc, collectionName));
 
 		return saved;