Getting an undefined error on this line when I select an agg from the dropdown:

What's the reason for removing the conditional here? This seems to alter the flow of the loop so that if there are no indexedFields only the first param will ever be rendered, whereas before all params up to the field param would be rendered.

The behavior you were seeing was a symptom of the error fixed in eaf5f1636fbebcca0b923de48576d84611ac8582.

This motivation for this change was preventing the aggParams directive from needing to know which params might need the indexedFields. As I say it though, I realize that every param for an aggConfig that has a field param is now getting indexedFields, because we are breaking out of the param and asking the agg for its fieldOptions. My mistake.