DATAMONGO-1094 - Fixed ambiguous field mapping error message in BasicMongoPersistentEntity.

Original pull request: #245.

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

@@ -53,7 +53,7 @@ import org.springframework.util.StringUtils;
 public class BasicMongoPersistentEntity<T> extends BasicPersistentEntity<T, MongoPersistentProperty> implements
 		MongoPersistentEntity<T>, ApplicationContextAware {
 
-	private static final String AMBIGUOUS_FIELD_MAPPING = "Ambiguous field mapping detected! Both %s and %s map to the same field name %s! Disambiguate using @DocumentField annotation!";
+	private static final String AMBIGUOUS_FIELD_MAPPING = "Ambiguous field mapping detected! Both %s and %s map to the same field name %s! Disambiguate using @Field annotation!";
 	private final String collection;
 	private final String language;
 	private final SpelExpressionParser parser;

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/mapping/MongoMappingContextUnitTests.java

@@ -106,6 +106,7 @@ public class MongoMappingContextUnitTests {
 		exception.expectMessage("firstname");
 		exception.expectMessage("lastname");
 		exception.expectMessage("foo");
+		exception.expectMessage("@Field");
 
 		MongoMappingContext context = new MongoMappingContext();
 		context.setApplicationContext(applicationContext);