I've recently upgraded to Plone 4.3.12 from an old 3.x site and have been noticing errors as Google crawls my site along the lines of:
CatalogError: Unknown sort_on index (relevance)
these from the /search_rss template, so
I thought it was some problem with migration of the catalog, but on trying out a fresh Plone 4.3.12 installation (via
docker run -p 8080:8080 plone:4), I can trigger the same error.
For example, if I browse to a user's page (
/author/someuser) and then follow the link to search for all content created by that user, I get to
/search?Creator=someuser&sort_on=created&sort_order=reverse. I can then select the "sort by relevance" link to go to
/@@search?sort_on=relevance&Creator=someuser, from where I can click on the RSS feed to get
/search_rss?sort_on=relevance&Creator=someuser, which gives the CatalogError.
Now that I know it's not my fault, I'm less worried, but it would be good to track this down.