Database
[{"_id":ObjectId("627a6fab60dc3c523b396aec"),"array1":[{"array2":[{"_id":ObjectId("627a6fab60dc3c523b396af1"),"name":"test"},{"_id":ObjectId("627a6fab60dc3c523b396af2"),"name":"ABC"}],"_id":ObjectId("627a6fab60dc3c523b396aed")},{"array2":[{"_id":ObjectId("627a6fab60dc3c523b396af3"),"name":"XYZ"},{"_id":ObjectId("627a6fab60dc3c523b396af4"),"name":"Testing"}],"_id":ObjectId("627a6fab60dc3c523b396aee")}]}]
Query
db.collection.update({"array1.array2._id":ObjectId("627a6fab60dc3c523b396af1")},{$set:{"array1.$[].array2.$[y].name":"John"}},{arrayFilters:[{"y._id":ObjectId("627a6fab60dc3c523b396af1")}]})