This file is indexed.

/usr/share/alsa/pulse-alsa.conf is in pulseaudio 1:8.0-0ubuntu3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# This file is referred to by /usr/share/alsa/pulse.conf to set pulseaudio as
# the default output plugin for applications using alsa when PulseAudio is
# running.

pcm.!default {
    type pulse
    hint {
        show on
        description "Playback/recording through the PulseAudio sound server"
    }
}

ctl.!default {
    type pulse
}