This random noise sound happens expectationally, no idea what it triggers.
I noticed this sound triggering once in a while since version 1.8 but never though anything of it because I couldn't find other hearing it. After doing some research I found it in a few YouTube video's of minecraft as well.
My first instinct was, is this some sort of cryptic easter egg? Well my tries resulted in nothing. So I'm not sure if this is a bug or an easter egg. I attached the noise.
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Thank you for your report!
We're actually already tracking this issue in MC-148360, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
Cave 14
https://minecraft.gamepedia.com/Ambience