Empty index feature
Since 2016 people are trying to find a good way to reset/whipe/delete/empty the INDEX when things go wrong. This issue is not solved. It takes massive amount of time to delete an index manually.
I had "assistance" from Adobe online chat. They even think it is possible. But when checking in Indesign. They too find it impossible to empty an index.
Zumo de Letras commented
This has been solved in other posts.
You search for the index markers in your text ˄I.
You erase them all from your text via a Search All
You then chose in your Index panel: Show unused themes
With one such theme selected you do Erase all unused themes.
Your index is empty.