Fix wrong default yes/no value (#254)

Author: abdullahkady

django_elasticsearch_dsl/management/commands/search_index.py

@@ -122,7 +122,7 @@ def _delete(self, models, options):
         if not options['force']:
             response = input(
                 "Are you sure you want to delete "
-                "the '{}' indexes? [n/Y]: ".format(", ".join(index_names)))
+                "the '{}' indexes? [y/N]: ".format(", ".join(index_names)))
             if response.lower() != 'y':
                 self.stdout.write('Aborted')
                 return False