Endpoint how to fetch raw MongoDB objectID from SpringBoot

I’m using SpringBoot as the backend to return MongoDB data upon receiving a request. However, when I use Postman to send a request, I find that the objectID has been automatically converted to the format {timestamp, date}, just like in my frontend application.
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I made test by print out the value that controller returns

    public ResponseEntity<List<Movie>> FindAllMovies() {
        for(var movie : movieService.findAllMovies()) {
        return new ResponseEntity<>(movieService.findAllMovies(), HttpStatus.OK);

It prints the raw objectID without conversion.

Movie(id=650341e34828196510d34049, title=White Noise, year=2022, cast=[Adam Driver, Greta Gerwig, Don Cheadle, Raffey Cassidy, Sam Nivola, May Nivola, Jodie 

I’m pretty confused when Objectid is being converted. Any advice of solving the problem?