You try to control it and minimize the damages:

1.Select your RGB color from the colors list and press “new color”.
2.Double click on your new color, inside the new color, change the mode to RGB, make sure you don’t have the error message and control the RGB handlers until you get to the desired color.
3. you have 2 options, either replace the colors in the find and replace the window (both objects and characters) or delete the old RGB color, and when you do that Indesign will ask you with what to replace it, and choose your new CMYK color. I recommend doing the last option, that way you have no doubt you changed each and every single place where the old color was.
photo editor