While I tried to follow the steps from this blog (https://www.elastic.co/blog/loading-wikipedia) to load the wikipedia dump into ES 5 alpha, I ran into issues with using the mapping that they provide at e.g. https://en.wikiquote.org/w/api.php?action=cirrus-mapping-dump
When talking with @jpountz he suggested opening an issue because the mapping contains some things that we should upgrade automatically better.