As part of the cross-wiki search results new functionality, we'll need to figure out if we want (or need) to have per wiki completion searches.
- it's not possible to merge existing completion suggesters
- and we don't want to
- how should we display results and UI to control local vs cross-project searching?
- see T145917
- integrated results require a single index (for scoring and pagination)
- displaying namespaces is hard
- namespaces can be translated by user language
- we should probably use canonical language from the source wiki
- namespace filters cause problems
- possible solutions:
- only get cross-wiki results in default namespace
- namespace searches are all local
- possible solutions:
- see T139504