[{_id:ObjectId("6616851ed50d6d1451fa8176"),phone:{countryCode:"7",areaCode:"926",number:"4585452"},name:"Aboba"}]

db.collection.aggregate([{"$set":{"phoneForSearch":{"$concat":["$phone.countryCode","$phone.areaCode","$phone.number"]}}},{"$match":{$expr:{$or:[/** phone search*/{$ne:[-1,{"$indexOfCP":["$phoneForSearch",/**user input here*/"7926"]}]},/** name search*/{"$regexMatch":{"input":"$name",/** name regex here*/"regex":"^abo","options":"i"}}]}}}])