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I thought the hot word was "ok google".
If the mic symbol in the search bar on the homescreen is outlined it means that it isnt listening, the mic is disabled.
Usually this happens when you launch an app with audio, so that the mic doesnt pick up the music or sounds. Sometimes when an app is still running in the background the mic will remain disabled and the symbol will be outlined.
Open your recent apps with the button next to the home button and swipe away any apps that produce sound, eg. Play Music, or any games etc. and the mic should go solid white and return to active.
I think this is a bug.
I do not think it is a bug, because if you are playing audio and the mic is outlined in white, you can still click the mic and the audio will stop so Google can hear you. I think it's a safety feature to prevent accidental hotword detection.