Apex domains cannot have CNAME records.
Question and response
Question
dig il-central-1.compute.amazonaws.com. NS
Answer
il-central-1.compute.amazonaws.com. 5 NS ns-304.awsdns-38.com.
il-central-1.compute.amazonaws.com. 5 NS ns-1206.awsdns-22.org.
il-central-1.compute.amazonaws.com. 5 NS ns-631.awsdns-14.net.
il-central-1.compute.amazonaws.com. 5 NS ns-1586.awsdns-06.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0