What is player state index?

The GetPlayerState node in blueprints have a parameter named Player State Index. The Unreal Engine documentation as well as its source code did not make it clear on what this parameter meant and whether. Can you explain to me what Player State Index is?

a player state is the file structure blueprint that is created when any new player joins the game

an index is a serialization starting at 0

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How can I get the player state index of a player?

I know.