migrating thread subsystem 1.1 to subsystem io in wildfly 14

[twaha]

We have a Jboss 7.1.1 configuration to migrate to wildfly 14 : Need help on how to transform the below subsystem to subsystem 'io' and subsystem 'undertow'

       <subsystem xmlns="urn:jboss:domain:threads:1.1">

            <bounded-queue-thread-pool name="custom-http-executor">

                <core-threads count="100"/>

                <queue-length count="500"/>

                <max-threads count="300"/>

                <keepalive-time time="120" unit="seconds"/>

            </bounded-queue-thread-pool>

I was unable to find sample configuration XML for subsystem 'IO' so far.