Apex domains cannot have CNAME records.
Question and response
Question
dig elserver.com. NS
Answer
elserver.com. 5 NS ns2.godns.net.
elserver.com. 5 NS ns1.godns.net.
elserver.com. 5 NS ns5.godns.net.
elserver.com. 5 NS ns4.godns.net.
elserver.com. 5 NS ns3.godns.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0