smart search

Inside your smart search index you can trigger a rebuild. This will send the rebuild to the scheduled task (execute search tasks) to be processed. If it isn't rebuilding then you might want to check for .lock files in the /App_Data/CMSModules/SmartSearch directory and sub directories.

Hi,

I just want to add that if you want to rebuild index on regular basis you would need to create a custom scheduled task for this purpose. More information could be found here https://docs.kentico.com/display/K9/Scheduling+custom+tasks. As for your question what is the purpose of Optimize search indexes scheduled task, basically it is something like "defragmentation"of index files. When you run this task it creates optimize tasks for every index.

Regards, Roman Konicek