Made MongoPersistentEntityIndexCreator an ApplicationListener again.

MongoPersistentEntityIndexCreator now listens to MappingContextEvents to ensure indexes for added entities *after* the initial set had been added.

spring-data-mongodb/src/main/java/org/springframework/data/document/mongodb/mapping/MongoPersistentEntityIndexCreator.java

@@ -30,6 +30,7 @@ import com.mongodb.MongoException;
 import com.mongodb.util.JSON;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.springframework.context.ApplicationListener;
 import org.springframework.dao.DataAccessException;
 import org.springframework.data.document.mongodb.CollectionCallback;
 import org.springframework.data.document.mongodb.MongoTemplate;
@@ -38,6 +39,7 @@ import org.springframework.data.document.mongodb.index.CompoundIndexes;
 import org.springframework.data.document.mongodb.index.IndexDirection;
 import org.springframework.data.document.mongodb.index.Indexed;
 import org.springframework.data.mapping.PropertyHandler;
+import org.springframework.data.mapping.event.MappingContextEvent;
 import org.springframework.data.mapping.model.PersistentProperty;
 import org.springframework.util.Assert;
 
@@ -48,7 +50,7 @@ import org.springframework.util.Assert;
  * @author Jon Brisbin <jbrisbin@vmware.com>
  * @author Oliver Gierke
  */
-public class MongoPersistentEntityIndexCreator {
+public class MongoPersistentEntityIndexCreator implements ApplicationListener<MappingContextEvent>{
 
   private static final Logger log = LoggerFactory.getLogger(MongoPersistentEntityIndexCreator.class);
 
@@ -68,6 +70,13 @@ public class MongoPersistentEntityIndexCreator {
       checkForIndexes(entity);
     }
   }
+  
+  /* (non-Javadoc)
+   * @see org.springframework.context.ApplicationListener#onApplicationEvent(org.springframework.context.ApplicationEvent)
+   */
+  public void onApplicationEvent(MappingContextEvent event) {
+    checkForIndexes((MongoPersistentEntity<?>) event.getPersistentEntity());
+  }
 
   protected void checkForIndexes(MongoPersistentEntity<?> entity) {
     Class<?> type = entity.getType();