custom fields disappear from field set when re-indexed
I am a dev on a team working on a sitecore multi-site setup. My Coveo search broke, and I can't get it working on my local instance. I imported the field set and applied, and then the fields show up correctly in the field set list. I compiled the code affected (as mentioned in the import / apply) and then checked the field set. the fields were still there. I then re-indexed. My search still does not work, and when I look at the field set, all of the custom fields have disappeared…. No idea why!
You are importing a field set in CES? This will of cource not work since C4SC will redefine your field set upon re-indexing.
In other words: this is the expected behavior.
Maybe I do not understand what you are trying to do. I think you may have missed a step in your team's procedures, like a missing configuration file in your Sitecore.
When you say: "as mentioned in the import / apply" => what are you talking about?