Untrack files from git using git bash

This will start ignoring the changes to the file:
git update-index --assume-unchanged path/to/file 

When you want to start keeping track again: 
git update-index --no-assume-unchanged path/to/file 

Now list files that are ignored: 
git ls-files -v 

And with a search options: 
git ls-files -v | grep "file_name_part"