Apex domains cannot have CNAME records.
Question and response
Question
dig indiakerala.com. NS
Answer
indiakerala.com. 5 NS ns-1100.awsdns-09.org.
indiakerala.com. 5 NS ns-1842.awsdns-38.co.uk.
indiakerala.com. 5 NS ns-1749.awsdns-26.co.uk.
indiakerala.com. 5 NS ns-1659.awsdns-15.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0