When there isn't much data in the index result sorting can be wildly wrong. The simplest way to fix this is to only use a single shard for really small wikis. We could also fix it by adding an extra query parameter to searches for small wikis. Read more here: http://www.elasticsearch.org/blog/understanding-query-then-fetch-vs-dfs-query-then-fetch/
Version: unspecified
Severity: normal