We're running a quite recent version of Phabricator that has D9321. When someone clicks 'Edit Maniphest Tasks' for a differential, they're faced with a nasty 'SearchParseException' error. Running the query in question by hand against ES produces more useful output: [...] nested: QueryParsingException[[phabricator] No query registered for [text]]; }]","status":400}.

The problem is that the 'text' query was quietly removed from elasticsearch 1.0 without being listed on the 'breaking changes in 1.0' page. It's been deprecated since 0.19 so I guess they decided it was okay to silently get rid of it.