Include thunbnail in serach results

I would like ton include the featured image in serach results?

I have found this code

<div class=”entry”>

<?php
if ( has_post_thumbnail() ) { // check if the post Thumbnail
the_post_thumbnail();
} else {
//your default img
}

the_excerpt(); //your short description
?>
</div>

This is the search.php for enfold

<?php
global $avia_config;

/*
* get_header is a basic wordpress function, used to retrieve the header.php file in your theme directory.
*/
get_header();

$results = avia_which_archive();
echo avia_title(array(‘title’ => $results ));
?>

<div class=’container_wrap container_wrap_first main_color <?php avia_layout_class( ‘main’ ); ?>’>

<div class=’container’>

<main class=’content template-search <?php avia_layout_class( ‘content’ ); ?> units’ <?php avia_markup_helper(array(‘context’ => ‘content’));?>>

<div class=’page-heading-container clearfix’>
<section class=”search_form_field”>
<?php
echo “<h4>”.__(‘New Search’,’avia_framework’).”</h4>”;
echo “<p>”.__(‘If you are not happy with the results below please do another search’,’avia_framework’).”</p>”;

get_search_form();
echo “<span class=’author-extra-border’></span>”;
?>
</section>
</div>

<?php
if(!empty($_GET[‘s’]) || have_posts())
{
echo “<h4 class=’extra-mini-title widgettitle’>{$results}</h4>”;

/* Run the loop to output the posts.
* If you want to overload this in a child theme then include a file
* called loop-search.php and that will be used instead.
*/
$more = 0;
get_template_part( ‘includes/loop’, ‘search’ );

}

?>

<!–end content–>
</main>

<?php

//get the sidebar
$avia_config[‘currently_viewing’] = ‘page’;

get_sidebar();

?>

</div><!–end container–>

</div><!– close default .container_wrap element –>

<?php get_footer(); ?>

Could I make this work? Any advice on where to place the code would be greatly appreciated.