For example use Wikipedia pageproperty:disambiguation to search all disambiguation pages containing "Wikipedia", or use pageproperty:displaytitle to search all articles with DISPLAYTITLE. This is also useful for Wikidata, e.g. together with haswbstatement you can find a list of humans (or any other subjects) without any sitelinks or without any identifiers.
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This is not a global concept - each wiki has their own pageproperty settings and trying to make this work across all wikis would be a bit of a nightmare. There is a pages with prop page which has a dropdown of properties were this could be done on a per wiki basis.
Note I don't propose a cross-wiki search feature in this task - this task is about searching page property of pages in one specific wiki.
Closing out low/est priority tasks over 6 months old with no activity within last 6 months in order to clean out the backlog of tickets we will not be addressing in the near term. Please feel free to reopen if you think a ticket is important, but bare in mind that given current priorities and resourcing, it is unlikely for the Search team to pick up these tasks for the indefinite future. We hope that the requested changes have either been addressed by or made irrelevant by work the team has done or is doing -- e.g. upgrading Elasticsearch to a newer version will solve various ES-related problems -- or will be subsumed by future work in a more generalized way.
Re-opening tasks and removing from team workboard per IRC feedback given yesterday and discussion with MPham.