functions.php

<?php
//@link https://searchwp.com/documentation/classes/swp_query/

global $post;

$swp_query = new SWP_Query( [
    's'      => 'coffee',  // Search query.
    'engine' => 'default', // Engine name.
] );

if ( $swp_query->have_posts() ) {
    while ( $swp_query->have_posts() ) : 
        $swp_query->the_post();
        ?>
        <div class="search-result">
            <h3><a href="<?php echo get_permalink(); ?>">
                <?php the_title(); ?>
            </a></h3>
            <?php the_excerpt(); ?>
        </div>
        <?php
    endwhile; 
    
    wp_reset_postdata();
} else {
    ?>
    <p>No results found.</p>
    <?php
}