unless you have that professionally done, you're going to be able to see that one ... and even with a pro, odds are you'll still see it under the right lighting and at the right angle. oddds are you have some kind of poly finish on that, and poly doesn't like to burn into itself when fixing finish marks
my advice for a simple and cheap fix: fingernail polish and then learning to love the mojo
wood glue is definitely NOT the fix answer for that
all the best,
R