Le 23/07/2015 20:03, Kevin Smith a écrit :

=Misspellings=

Reducing to 1 char the prefix length can hurt perfs and it's certainly a good idea to do this in 2 passes as Erik suggested.

Yeah, I worry about performance with prefix=1—but we can test it in small scale and see what it costs and how much it helps.

I had a look at the current mapping and it looks like (I have to carefully check before) that there is two unused suggest fields (title.suggest & redirect.title.suggest) in the index.
I think It's related to https://gerrit.wikimedia.org/r/#/c/118650/ & https://gerrit.wikimedia.org/r/#/c/118651/. I guess the old fields were kept to switch back rapidly to the old config?
If we confirm that these fields are unused and prefix length is an issue we could reclaim this unused space to add another suggest field with a reverse filter.

This requires a reindex so it's worth checking if prefix is really an issue.