diff --git a/src/test/java/org/springframework/data/elasticsearch/core/CustomEntityMapper.java b/src/test/java/org/springframework/data/elasticsearch/core/CustomEntityMapper.java
index 38266fd66..c51c75f11 100644
--- a/src/test/java/org/springframework/data/elasticsearch/core/CustomEntityMapper.java
+++ b/src/test/java/org/springframework/data/elasticsearch/core/CustomEntityMapper.java
@@ -7,13 +7,19 @@ import java.io.IOException;
  */
 public class CustomEntityMapper implements EntityMapper {
 
+    public CustomEntityMapper(){
+        //custom configuration/implementation (e.g. FasterXML/jackson)
+    }
+
     @Override
     public String mapToString(Object object) throws IOException {
+        //mapping Object to String
         return null;
     }
 
     @Override
     public <T> T mapToObject(String source, Class<T> clazz) throws IOException {
+        //mapping String to Object
         return null;
     }
 }
diff --git a/src/test/resources/elasticsearch-template-custom-mapper.xml b/src/test/resources/elasticsearch-template-custom-mapper.xml
index 98ab707f9..d3712b8f5 100644
--- a/src/test/resources/elasticsearch-template-custom-mapper.xml
+++ b/src/test/resources/elasticsearch-template-custom-mapper.xml
@@ -1,17 +1,17 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
-	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xmlns:elasticsearch="http://www.springframework.org/schema/data/elasticsearch"
-	xsi:schemaLocation="http://www.springframework.org/schema/data/elasticsearch http://www.springframework.org/schema/data/elasticsearch/spring-elasticsearch-1.0.xsd
+       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+       xmlns:elasticsearch="http://www.springframework.org/schema/data/elasticsearch"
+       xsi:schemaLocation="http://www.springframework.org/schema/data/elasticsearch http://www.springframework.org/schema/data/elasticsearch/spring-elasticsearch-1.0.xsd
 		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd">
 
-	<import resource="infrastructure.xml" />
+    <import resource="infrastructure.xml"/>
 
-	<bean name="elasticsearchTemplate"
-		class="org.springframework.data.elasticsearch.core.ElasticsearchTemplate">
-		<constructor-arg name="client" ref="client" />
+    <bean name="elasticsearchTemplate"
+          class="org.springframework.data.elasticsearch.core.ElasticsearchTemplate">
+        <constructor-arg name="client" ref="client"/>
         <constructor-arg name="entityMapper" ref="entityMapper"/>
-	</bean>
+    </bean>
 
     <bean name="entityMapper" class="org.springframework.data.elasticsearch.core.CustomEntityMapper"/>