Plug it. I have been plugging tires since I was five or six.
My dad used have me rotate the wheels on his cars diagonally every 14 days and if I found a nail I was to pull and plug. Never had an issue.
On the one bike I have tubeless tires on I tend to use between 2 and 8 plugs over a rear tires life, no problems.
I would replace a front, however.