Under 10.2.600 -> Over 10.2.600 Enterprise Search added an API Key

Kinetic ERP Service Packs and Major Upgrades (any → 20XY.Z)
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The upgraded Enterprise Search Index needs to be deleted and recreated so the API key is created.

More info here
https://epiccare.epicor.com/epiccare?id=epiccare_kb_article&sys_id=ab46c4ed1b1aa0d0d4a5c8415b4bcb30