VSTS | TFS 2018.2
With wiki search, you can search within a team project wiki or across all wikis created for the account. Simply select the Search wiki option from the search box and type a keyword or phrase within the search box.
The search feature quickly returns wiki pages by title or page content.
Wiki search is supported on TFS 2018.2 or later versions. To download TFS 2018.2, see Team Foundation Server 2018 Update 2 Release Notes.
English language stemming support helps you find the most relevant wiki pages. For example, when you enter request in the search box, wiki search will return page results containing related words such as requesting, requested, requests, and so on.