FriendsOfSymfony/FOSElasticaBundle — pull request #742 by DjangoFR (2014-11-19 13:33:08+00:00)
Title: Built-in templates use a base64 encoded image for the toolbar

As described in: http://symfony.com/doc/current/cookbook/profiler/data_collector.html#adding-web-profiler-templates

Otherwise if there is no asset deployment in your project you can't see icons in profiler.