The CirrusSearch extension comes with a feature to improve the search suggestions as you type on the search box, which stores those suggestions in its own index. However, I found that this index is not updated as pages are created. The normal search finds new pages, but the search suggestions don’t suggest titles of newly created pages… until I run the updateSuggesterIndex.php maintenance script.
Since there’s no documentation about that, and I expected this index to update automatically, the question is, does the suggester index update automatically (which means it’s somehow broken on my wiki)? Or by design one should the updateSuggesterIndex.php periodically?