Not directly a search feature in the sense of our normal queries,
indexes, and results pages, but I thought this research by Amir Elisha
Aharoni is worth mentioning on this list.

Amir has logged the queries people search for via the Compact Language
Links search box. He then provides a list of "most wanted" articles.

>From Amir, "This is a report of the articles that people most often
try to find in a different language, and cannot find. This is done by
logging the searches in the Compact Language Links' language search
box that don't yield any results. For example, if somebody goes to the
English Wikipedia article en:Newspaper, searches for "telugu", and
this article doesn't exist in the Telugu Wikipedia, this is logged and
counted here."

https://lists.wikimedia.org/pipermail/wikimedia-l/2018-May/090376.html

https://meta.wikimedia.org/wiki/Most_wanted_articles_across_languages


Yours,
Chris Koerner
Community Liaison
Wikimedia Foundation

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