NTP hostname is not resolved

When i am trying to initialize true time using TrueTime.build().initialize() in a background thread and I am getting this exception:

"Unable to resolve host "1.us.pool.ntp.org": No address associated with hostname"

Start from the TrueTime.build().initialize() entry point and reproduce the failure when initialization runs in a background thread. Trace the NTP hostname-resolution path and determine the conditions needed for initialization to handle 1.us.pool.ntp.org; done means the reported exception is addressed and the behavior is covered by an appropriate test.

Written by the indexing model from the issue text.