I find maps with numbered stars, such as map # 1472859. What is the purpose of these stars ? Thank you to anyone that answers.

Such map does not exist.

The map (https://www.warzone.com/SinglePlayer?PreviewMap=1472859) indeed doesnt exist (or has been deleted).

I suspect you are talking about the Single Player level (https://www.warzone.com/SinglePlayer?Level=1472859).

The numbered starts are the picks your AI teammates have made.
The number in the star indicates the priority of the pick (Warzone tries to give every player their #1, then their #2, etc), and the color of the star indicates the player that made the picks.

Thank you JK. I've always wondered about that but never noticed the correlation.