commit 1dcaadbe6f99b42b346e04239c0c8fd7812bbf51
Persister/ObjectPersister.php
line 112: $this->type->updateDocuments($documents);
introduces a dependency on Elastica 0.9.10.0
Merge pull request #563 from PeerJ/UpdateElasticaDependency

Update Elastica Dependency
use elastica library 1.1 and higher
remove empty fields arrays from mapping, this is not ignored anymore by elasticsearch 1.*
Also cleanup fields in properties of objects
still supporting 0.9 versions of elastica
Merge pull request #565 from FriendsOfSymfony/elasticsearch-1.1

Elasticsearch 1.*
Changed QueryBuilder method from ->where() to ->andWhere() so it works with customised QueryBuilders which have an existing where clause (instead of over-writing any existing DQL 'where' part)
Merge pull request #567 from caponica/ToModelTransformer_andWhere

Changed QueryBuilder method from ->where() to ->andWhere() ...