Problem:
As part of data quality work , editors would like to restrict their search results to Items that do (not) have a sitelink to a particular wiki. It was suggested to introduce a new keyword similar to the other Wikibase-specific ones documented at https://www.mediawiki.org/wiki/Help:Extension:WikibaseCirrusSearch.

Example:
"wbhassitelink:dewiki" would restrict the search results to Items that have a sitelink to German Wikipedia.