This post describes a scenario where I needed to reuse the configuration of a Sitecore index. I'm not sure how common the requirement is, but maybe you can repurpose it for your own needs.
I recently read an article by Jonathan Robbins about indexing custom xDB facets . While following the instructions in his post I did a little research of my own and found a handy little shortcut.
This quick post provides a fix for an error you might encounter after installing the Coveo for Sitecore package. It occurs when the Sitecore instance in question uses Solr as it's 'main' indexing engine. I got the problem with Coveo for Sitecore 80 4.0 (780) , but I imagine it affects other releases too.