Redirect to Post when search only returns 1

<?php
 
add_action( 'template_redirect', 'template_redirect_example' );
function template_redirect_example() {
 
    if ( is_search() ) {
     
        global $wp_query;
         
        if ( 1 == $wp_query->post_count && 1 == $wp_query->max_num_pages ) {
            wp_redirect( get_permalink( $wp_query->posts['0']->ID ) );
            exit;
        }
         
    }
     
}