Since the code for T109561 is checked in, now we need to roll out this feature for all users. I propose the following plan:
[x] Select several wikis with active admin community
[x] Reindex those wikis to enable archive mapping (once datacenter switch has been completed)
[x] Enable archive indexing configs for those wikis
[x] Index archives for these wikis (forceSearchIndex.php --archive)
[x] Post a notice on admin boards for those wikis asking for testing/feedback
[x] Enable indexing for new archive deletes
[x] Once feedback is collected, do the changes if needed (assuming it's ok to proceed)
[x] Reindex rest of the wikis to enable the archive index again
[x] Enable archive indexing configs for all wikis
[x] Index archives for these wikis (forceSearchIndex.php --archive)
[x] Post a notice on mailing lists (which ones?) and admin noticeboards about this capability
[] Wait for feedback and adjustments, if no negative pushback happening, enable ES search by default without fuzzy option (*)
Note that until the step marked with (*) the default search still does not use ElasticSearch and `fuzzy=1` option is needed to enable it.