Database
[{"_id":{"$oid":"6555453298c59137f9cb2ee5"},"userId":{"$oid":"6555453298c59137f9cb2ee3"},"email":"aaaaaa@aaa.com","items":[{"quantity":3,"product":{"$oid":"655437995bc92c0647deb512"},"_id":{"$oid":"65555277fe01541a2052bd5f"}},{"quantity":1,"product":{"$oid":"655437995bc92c0647deb513"},"_id":{"$oid":"65555278fe01541a2052bd65"}}]}]
Query
db.collection.update({"email":"aaaaaa@aaa.com",/** email*/},{"$inc":{"items.$[item].quantity":1}},{"arrayFilters":[{"item.product":ObjectId("655437995bc92c0647deb512")/** productId*/}]})