There are several system preferences related to searching, it is not always recommended to make too many changes to these preferences since they are set to get you the most relevant results. If you would like to change the default way that Koha handles searching, view the Searching system preferences tab.
Set up your cron jobs
Decide how often your system rebuilds the search index (4-10 min)
Searching System Preferences
AdvancedSearchTypes : Decide which authorized value fields you want patrons and staff to be able to limit their advanced searches by
AdvancedSearchLanguages : Decide which languages you want people to be able to limit to via the search engine
UseAuthoritiesForTracings : Decide how you want Koha to handle subject searches in the OPAC
displayFacetCount : Decide whether to show facet counts on search results