Thread:Extension talk:CirrusSearch/Update of index/reply

Generally, no cronjob or Windows Task is required to update the index -- it just happens. You can just test this yourself by adding a new page and then searching for something in the body.

The index updates will happen as part of the normal operation of the wiki engine. If you've left $wgJobRunRate alone, then some maintenance tasks get executed as part of periodic user page requests. If you set that variable to zero, you're responsible for setting up a cron job to call wp-cron.php, which will perform the required maintenance tasks.