Add the Analytics Full Extension field group

If the schema is the blueprint, field groups are the pre-drawn room templates you drop into it, and for an Analytics migration, one of them does almost all the work. The Adobe Analytics ExperienceEvent Full Extension adds the entire _experience.analytics structure, every eVar, prop, event, and hierarchy, and, crucially, the Edge already knows how to translate those fields straight into your Analytics variables[3][4] with no processing rules. Choose it and most of your mapping becomes drag-and-drop; skip it and you hand-wire each variable through processing rules later. It's a small step that quietly decides whether the next steps are easy or painful.