[GEM] Improves handling of YAML parsing

Author: picandocodigo

elasticsearch/lib/elasticsearch.rb

@@ -96,7 +96,7 @@ def verify_elasticsearch
 
       body = if response.headers['content-type'] == 'application/yaml'
                require 'yaml'
-               YAML.load(response.body)
+               YAML.safe_load(response.body)
              else
                response.body
              end