Manual:$wgDisableSearchContext

Performance hacks and limits: $wgDisableSearchContext
Setting this 'false' enables display of additional information on specific date/page revisions in search results.
Introduced in version:1.6.0 (r11443)
Removed in version:1.17.0 (r70695)
Allowed values:(boolean)
Default value:false

DetailsEdit

Not used in core MediaWiki code; it was used in Extension:LuceneSearch where setting this 'false' enables display of additional information on specific date/page revisions in search results.