I want to replace helm-projectile-grep with helm-projectile-ag without using default binding (C-c p s s).
For example if I use helm-projectile-switch-project (C-c p p), then in the helm window I press C-s, then it will invoke helm-projectile-grep, but I want to use helm-projectile-ag instead because it's faster. I don't know what other search action will invoke helm-projectile-grep, but whenever I call the function, I want it to call helm-projectile-ag instead. Is it possible, how can I map it in my .emacs?