The actual relevance ranking is done within Zebra, you will find the "Zebra - User's Guide and Reference" here (unfortunately the link to this guide in the Koha manual is dead): * http://www.indexdata.com/zebra/doc/
For relevance ranking start here: * http://www.indexdata.com/zebra/doc/administration-ranking.html
Hi Michael and all, please report any problems with the manual that you spot or know of. We have a pad that you can just type into, no registration required: https://annuel2.framapad.org/p/KohaManualTodo Also feel free to submit a patch directly, instructions are here: https://wiki.koha-community.org/wiki/Editing_the_Koha_Manual You can also send us text directly to format and include. I would love if we could add more information about how the relevance ranking works! Katrin