I am upgrading from 8.1 to 9.1, and I'm switching to Solr before the actual upgrade.
I have a rather elaborate custom index configuration, and I converted it to Solr at the best of my knowledge. The configuration node mentioned in the title exists both in the default Solr configuration and in my custom one, but it's not being detected for some reason.
I used Dotpeek to see what's happening under the hood but was unable to determine what exactly is going wrong.
I am also unable to access
/sitecore/admin/showconfig.aspx as the web application does not start.
What is the best way to troubleshoot my configuration error? Should I perhaps use the one that comes with my Sitecore release and then gradually change it file-by-file until it matches mine, or what else?