added finalize method to close connection to elasticsearch when this instance is no longer needed

git-svn-id: http://svn.research-infrastructures.eu/public/d4science/gcube/trunk/social-networking/social-data-search-client@130208 82a268e6-3cf1-43bd-a215-b396298e98cf

src/main/java/org/gcube/socialnetworking/social_data_search_client/ElasticSearchClientImpl.java

@@ -181,4 +181,12 @@ public class ElasticSearchClientImpl implements ElasticSearchClientInterface{
 		return response.isFound();	
 
 	}
+	
+	@Override
+	protected void finalize() throws Throwable {
+		super.finalize();
+		_log.info("Called finalize.. closing connection to elasticsearch");
+		client.close();
+	}
+	
 }