In ES 5, default maximum number of fields in index is 1000. This won't be enough for per-language index fields in wikidata, so we'd need to bump the maximum. 5000 seems like a good future-proof number - we have ~400 languages, and they need 3 fields for labels and ~2 fields for descriptions.
We should of course ensure bumping this max does not cause any trouble, but so far the indications are it doesn't.
| Status | Subtype | Assigned | Task | ||
|---|---|---|---|---|---|
| Resolved | debt | T151324 [epic] System level upgrade for cirrus / elasticsearch | |||
| Resolved | Deskana | T154501 [Epic, Q3 Goal] Upgrade search systems to Elasticsearch 5 | |||
| Resolved | Smalyshev | T158278 Bump maximum number of fields to 5000 for wikidata indexes |
This isn't something we will need to do globally, rather in mediawiki-config we will need to set $wgCirrusSearchExtraIndexSettings['index.mapping.total_fields.limit'] = 5000; when the current wiki is wikidata.
I suppose we might also need a similar setting in vagrant so testing works as expected.