Remove auto populate current user email for application meta key in admin area on new listings for WP Job Manager

functions.php

<?php

add_filter( 'job_manager_job_listing_data_fields', 'smyles_remove_auto_populate_application_email', 999999999, 2 );

/**
 * Remove Auto Populate application meta key with user email in admin area
 *
 * @see https://github.com/Automattic/WP-Job-Manager/issues/1591
 *
 * @param $fields
 * @param $post_id
 *
 * @return array
 */
function smyles_remove_auto_populate_application_email( $fields, $post_id ){

	if( isset( $fields['_application'] ) && ! metadata_exists( 'post', $post_id, '_application' ) ){
		$fields['_application']['value'] = '';
	}

	return $fields;
}