Manual:$wgSearchRunSuggestedQuery

Search: $wgSearchRunSuggestedQuery
If search returns zero results and current search engine has a "did you mean" suggestion, results for the suggestion will be shown.
Introduced in version:1.26.0 (Gerrit change 244100; git #0379e466)
Removed in version:still in use
Allowed values:(boolean)
Default value:true

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If search returns zero results and current search engine has a "did you mean" suggestion, results for the suggestion will be shown.