RHEL7.x - Disable ipv6 for BIND

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Hello,

Red Hat Enterprise Linux Server 7.7 (Maipo)
bind-9.11.4-9.P2.el7.x86_64

could anyone point me to some documentation how to disable ipv6 for BIND on RHEL7.x? We have disabled ipv6 completely, at boot level, but still getting a lot of spam in /var/log/messages

Nov 23 18:09:28 gw1 named[3533]: network unreachable resolving '3.rhel.pool.ntp.org/A/IN': 2001:500:a8::e#53
Nov 23 18:09:28 gw1 named[3533]: network unreachable resolving './NS/IN': 2001:500:9f::42#53
Nov 23 18:09:28 gw1 named[3533]: network unreachable resolving '3.rhel.pool.ntp.org/AAAA/IN': 2001:500:a8::e#53
Nov 23 18:09:28 gw1 named[3533]: network unreachable resolving './NS/IN': 2001:500:2::c#53
Nov 23 18:09:28 gw1 named[3533]: network unreachable resolving '3.rhel.pool.ntp.org/A/IN': 2001:500:9f::42#53
Nov 23 18:09:28 gw1 named[3533]: network unreachable resolving '3.rhel.pool.ntp.org/AAAA/IN': 2001:500:9f::42#53
Nov 23 18:09:28 gw1 named[3533]: network unreachable resolving './NS/IN': 2001:500:2d::d#53
Nov 23 18:09:28 gw1 named[3533]: network unreachable resolving '3.rhel.pool.ntp.org/A/IN': 2001:500:2::c#53
Nov 23 18:09:28 gw1 named[3533]: network unreachable resolving '3.rhel.pool.ntp.org/AAAA/IN': 2001:500:2::c#53
Nov 23 18:09:28 gw1 named[3533]: network unreachable resolving '3.rhel.pool.ntp.org/A/IN': 2001:500:2d::d#53
Nov 23 18:09:28 gw1 named[3533]: network unreachable resolving '3.rhel.pool.ntp.org/AAAA/IN': 2001:500:2d::d#53
Nov 23 18:09:30 gw1 named[3533]: network unreachable resolving './NS/IN': 2001:500:200::b#53
Nov 23 18:09:30 gw1 named[3533]: network unreachable resolving '3.rhel.pool.ntp.org/A/IN': 2001:500:200::b#53
Nov 23 18:09:30 gw1 named[3533]: network unreachable resolving '3.rhel.pool.ntp.org/AAAA/IN': 2001:500:200::b#53
Nov 23 18:09:34 gw1 named[3533]: network unreachable resolving './NS/IN': 2001:500:12::d0d#53
Nov 23 18:09:34 gw1 named[3533]: network unreachable resolving '3.rhel.pool.ntp.org/A/IN': 2001:500:12::d0d#53
Nov 23 18:09:34 gw1 named[3533]: network unreachable resolving '3.rhel.pool.ntp.org/AAAA/IN': 2001:500:12::d0d#53
Nov 23 18:09:37 gw1 named[3533]: network unreachable resolving './NS/IN': 2001:500:1::53#53
Nov 23 18:09:37 gw1 named[3533]: network unreachable resolving '3.rhel.pool.ntp.org/A/IN': 2001:500:1::53#53
Nov 23 18:09:37 gw1 named[3533]: network unreachable resolving './NS/IN': 2001:7fe::53#53
Nov 23 18:09:37 gw1 named[3533]: network unreachable resolving '3.rhel.pool.ntp.org/AAAA/IN': 2001:500:1::53#53
Nov 23 18:09:37 gw1 named[3533]: network unreachable resolving '3.rhel.pool.ntp.org/A/IN': 2001:7fe::53#53
Nov 23 18:09:37 gw1 named[3533]: network unreachable resolving '3.rhel.pool.ntp.org/AAAA/IN': 2001:7fe::53#53

Using OPTION=-4 in /etc/sysconfig/named is for RHEL6.x. It doesn't work on RHEL7.x.

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