Exclude Past Events from WordPress Serach

Hello,

I am trying to add code to my child theme functions.php to exclude past events from the standard WordPress Search. I have the code blow from another thread, but it is not working. Any help is appreciated, as I see this is an issue that many are trying to resolve.

add_action( 'pre_get_posts', function( $query ) {

	if ( ! is_admin() && $query->is_main_query() && $query->is_search() ) {

	  	$today = date('Y-m-d');

		$meta_query = array(

		'relation' => 'or',

			array(

			'key'=>'event_start_date',

			'value'=>current_time( 'Y-m-d' ),

			'compare'=>'>=',

			'type' => 'DATE'

			),

			array(

					'key'     => 'event_start_date',

					'compare' => 'NOT EXISTS',

				),

		);

		$query->set('meta_query',$meta_query);

	}

});

https://www.ads-software.com/plugins/events-manager/