diff --git a/lib/embulk/input/elasticsearch/connection.rb b/lib/embulk/input/elasticsearch/connection.rb
index 0d05e38..4173e36 100644
--- a/lib/embulk/input/elasticsearch/connection.rb
+++ b/lib/embulk/input/elasticsearch/connection.rb
@@ -74,7 +74,7 @@ def search_with_retry
               retry
             end
             msg = "Could not search to Elasticsearch after #{retries} retries. #{e.message}"
-            raise Elasticsearch::ConfigError(e, msg)
+            raise Elasticsearch::ConfigError.new(e, msg)
           end
         end