fix conflict with ruflen/Elastica SetLogger

https://github.com/FriendsOfSymfony/FOSElasticaBundle/issues/302
https://github.com/ruflin/Elastica/commit/c8d53312b103925d8dbdf4cf23b0ff
f2fe200879
Merge pull request #1 from heyflynn/master

fix conflict with ruflen/Elastica SetLogger