Manual:$wgEnableOpenSearchSuggest

Search: $wgEnableOpenSearchSuggest
Enable OpenSearch suggestions requested by MediaWiki.
Introduced in version:1.16.0 (r57986)
Deprecated in version:1.35.0 (Gerrit change 557077; git #15dbbe32)
Removed in version:1.40.0 (Gerrit change 838769; git #bb10b7d5)
Allowed values:(boolean)
Default value:true

Details

Enable OpenSearch suggestions requested by MediaWiki. Set this to false if you've disabled another suggestion script and want to reduce load caused by cached scripts pulling suggestions.