template.php

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

global $post;

$args = [
    's'         => get_search_query(),
    'tax_query' => [ [
        'taxonomy' => 'people',
        'field'    => 'slug',
        'terms'    => 'bob',
    ] ],
];

// If a search query is present use SWP_Query
// else fall back to WP_Query
if ( ! empty( $args['s'] ) ) {
    $swp_query = new SWP_Query( $args );
} else {
    $swp_query = new WP_Query( $args );
}

// Loop through results.
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
}