Merge pull request #2 from giwa/raise-error

fix initialization

Author: giwa

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