[bug 940361] Change size on facet calls

The default size is 10. When we use that number, we get "inaccurate"
facet counts:

http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-facets-terms-facet.html#_accuracy_control

This increases the size to 1000 which should make it more accurate and
thus the counts between two different pages should be the same.
Merge pull request #366 from willkg/940361-facet-counts

[bug 940361] Change size on facet calls