Manual:$wgSearchRunSuggestedQuery

From Linux Web Expert

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

Details

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