The {{Extension}} infobox template supports a parameter 'compatibility policy' to specify whether the extension tries to maintain compatibility with old versions of MediaWiki in its master branch (value 'master') or maintains release branches for supported release versions of MediaWiki (value 'rel').

Please edit https://www.mediawiki.org/wiki/Extension:CirrusSearch to add this parameter with the appropriate value, so I know for sure whether I need to add if ( is_callable( ... ) ) style tests every time I deprecate something in core and need to update the extension to use the new way.

Thanks.