I have an S&W Doug Koenig Edition 1911 in .38 Super from the Performance Center. It came with a fiber optic front sight and as I use the gun almost exclusively for bullseye work, I found that sight too imprecise and wanted to change it to the black Patridge that is the preferred sight for that usage. I have a jig-like tool for moving or replacing dovetailed sights so obtained a sight from S&W and set out to make the change.
Long story short, between our 16-month-old granddaughter "helping" me and my not noticing that the tool had shifted downward slightly, the threaded portion of the sight "pusher" was bearing against the upper surface of the slide and left some very obvious deep grooves in it. As I paid a lot of money for that beautiful limited-production gun, I was heartsick but took the gun to the local gunsmith I use and ashamedly asked if he could salvage the gun's original appearance. A few weeks, the gun looked like new.
I don't know how he fixed it but given my experience with damage a lot worse than yours, I would seek the advice of a gunsmith if the mark really bugs you. Seeing it, I can tell you that my guy certainly could make it disappear. In case you would like to speak with him, his name is Chad and his shop is McCauslin Rifles, Carlisle, Pennsylvania, 717-258-6607.
Ed