diff --git a/spring-data-mongodb/pom.xml b/spring-data-mongodb/pom.xml
index 7dc8d1949..e82d4cc68 100644
--- a/spring-data-mongodb/pom.xml
+++ b/spring-data-mongodb/pom.xml
@@ -12,7 +12,7 @@
 	<name>Spring Data MongoDB</name>
 
 	<properties>
-		<mongo.version>2.6.5</mongo.version>
+		<mongo.version>2.7.1</mongo.version>
 		<querydsl.version>2.2.4</querydsl.version>
 	</properties>
 
diff --git a/spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/mapreduce/GroupByResults.java b/spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/mapreduce/GroupByResults.java
index 577f79133..4289e8afd 100644
--- a/spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/mapreduce/GroupByResults.java
+++ b/spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/mapreduce/GroupByResults.java
@@ -39,6 +39,8 @@ public class GroupByResults<T> implements Iterable<T> {
 	
 	private int keys;
 	
+	private String serverUsed;
+	
 	public GroupByResults(List<T> mappedResults, DBObject rawResults) {
 		Assert.notNull(mappedResults);
 		Assert.notNull(rawResults);
@@ -46,6 +48,7 @@ public class GroupByResults<T> implements Iterable<T> {
 		this.rawResults = rawResults;
 		parseKeys();		
 		parseCount();
+		parseServerUsed();
 	}
 	
 	public double getCount() {
@@ -55,6 +58,10 @@ public class GroupByResults<T> implements Iterable<T> {
 	public int getKeys() {
 		return keys;
 	}
+	
+	public String getServerUsed() {
+		return serverUsed;
+	}
 
 	public Iterator<T> iterator() {
 			return mappedResults.iterator();
@@ -65,18 +72,25 @@ public class GroupByResults<T> implements Iterable<T> {
 	}
 	
 	private void parseCount() {
-		Object object = (Object) rawResults.get("count");
+		Object object = rawResults.get("count");
 		if (object instanceof Double) {
-			count = (Double)object;
+			count = (Double) object;
 		}
 		
 	}
 
 	private void parseKeys() {
-		Object object = (Object) rawResults.get("keys");
+		Object object = rawResults.get("keys");
 		if (object instanceof Integer) {
-			keys = (Integer)object;
+			keys = (Integer) object;
 		}		
 	}
 	
+	private void parseServerUsed() {
+		//"serverUsed" : "127.0.0.1:27017"
+		Object object = rawResults.get("serverUsed");
+		if (object instanceof String) {
+			serverUsed = (String) object;
+		}
+	}
 }
diff --git a/spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/mapreduce/GroupByTests.java b/spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/mapreduce/GroupByTests.java
index 9be6a8a1d..c1c112bcb 100644
--- a/spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/mapreduce/GroupByTests.java
+++ b/spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/mapreduce/GroupByTests.java
@@ -161,7 +161,7 @@ public class GroupByTests {
 	
 	private void assertMapReduceResults(GroupByResults<XObject> results) {
 		DBObject dboRawResults = results.getRawResults();
-		String expected = "{ \"retval\" : [ { \"x\" : 1.0 , \"count\" : 2.0} , { \"x\" : 2.0 , \"count\" : 1.0} , { \"x\" : 3.0 , \"count\" : 3.0}] , \"count\" : 6.0 , \"keys\" : 3 , \"ok\" : 1.0}";
+		String expected = "{ \"serverUsed\" : \"127.0.0.1:27017\" , \"retval\" : [ { \"x\" : 1.0 , \"count\" : 2.0} , { \"x\" : 2.0 , \"count\" : 1.0} , { \"x\" : 3.0 , \"count\" : 3.0}] , \"count\" : 6.0 , \"keys\" : 3 , \"ok\" : 1.0}";
 		Assert.assertEquals(expected, dboRawResults.toString());
 		
 		int numResults = 0;