- The search loops through all fields, including the structure field (but score-wise, it is treated as a single field)
2a. If this option is set to true, Kirby will only search for words; for example, if you search for “refresh” it will find “refresh” or “pull-to-refresh” but not “refreshing”. Note that search does not search for expressions but words only! See this post: How to use search to include multiple "words"
2b. You can define a score for each field, for example, if the search result should be more relevant if the search word appears in the title
'score' => array('title' => 3)
The default score per field is 1.
If you want to know more, check out the source code in /kirby/pages.php, #172ff.