[{"name":"éloé"},{"name":"Alexei Ramírez"}]

db.collection.update({},[{"$set":{"searchName":{"$reduce":{"input":[["é","e"],["í","i"]],"initialValue":"$name","in":{"$replaceAll":{"input":"$$value","find":{"$arrayElemAt":["$$this",0]},"replacement":{"$arrayElemAt":["$$this",1]}}}}}}}],{"multi":true})