I think the first task should be to find out whether this is an Elasticsearch problem or a PHP issue. Can you check the elasticsearch logs and see if there are any error messages?
ok, if there are no helping messages in the ES logs, I think your best bet is to share this with the people around FOSElasticaBundle and see if they got a mailinglist or an issue tracker, as I am not sure they are reading this forum. Maybe there is an option for more insight on what that call is doing.
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