R1:6c7f36f6b81b

Use filtered query instead of filter in Elasticsearch

Summary:
The 'filter' works like this: Get all results matching query (all if there's no query), compute facets (if there are any) and then filter out the uninteresting results.
The 'filtered' query applies the filters when searching, not when processing results.
This is obviously not documented anywhere in the great Elasticsearch documentation.
http://stackoverflow.com/questions/14007078/performance-of-elastic-queries

We don't hit this problem very…