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 [[ http://www.elasticsearch.org/guide/en/elasticsearch/reference/0.90/query-dsl-text-query.html#query-dsl-text-query|deprecated since 0.19]] so I guess they decided it was okay to silently get rid of it.