Is it possible to change questions in an index?
For an index to be calculated in a survey result, all questions that belongs to that index by default needs to be included.
If a default index question is swapped for another question in a survey, that is not by default included in the index, the index will not be able to be calculated.
If however you copy an index question, creating an own version of it, this question will be able to be used instead of the default question.
In below articles, you can read further about this: