Fix OpenSearch compatibility issue (#30278)

lib/elasticsearch/client_extensions.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+module Elasticsearch
+  module ClientExtensions
+    def verify_elasticsearch
+      @verified = true
+    end
+  end
+end
+
+Elasticsearch::Client.prepend(Elasticsearch::ClientExtensions)