No need to show the exceptions body info when index not found (#59)

* No need to show the exceptions body info when index not found

* Update elasticsearch_publisher.py

* Update elasticsearch_publisher.py

* Update elasticsearch_publisher.py

* Update elasticsearch_publisher.py

* Update elasticsearch_publisher.py

databuilder/publisher/elasticsearch_publisher.py

@@ -135,7 +135,8 @@ class ElasticsearchPublisher(Publisher):
             indices = self.elasticsearch_client.indices.get_alias(self.elasticsearch_alias).keys()
             return indices
         except NotFoundError:
-            LOGGER.warn("Received index not found error from Elasticsearch", exc_info=True)
+            LOGGER.warn('Received index not found error from Elasticsearch. ' +
+                        'The index doesnt exist for a newly created ES.')
             # return empty list on exception
             return []