Replacing search results with custom external query

I’d like to replace the existing search function with an external query (from Solr) but I’m having trouble showing the results in the search.php page. This is the code I have in functions.php:

add_action('pre_get_posts', 'my_search_query');

function my_search_query($query) {
    if($query->is_search() && $query->is_main_query() && get_query_var('s', false)) {   

    $desired_query = get_query_var('s', false);

    $url = 'http://{SOLR_SERVER}:8983/solr/{CORE}/select?indent=on&q=' . $desired_query . '~2&wt=json';
    $result = file_get_contents($url);
    $data = json_decode($result, true);

    $ids = array();
    foreach ($data['response']['docs'] as $item)
    {
        array_push($ids, $item['id']);
    }

    $paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
    $query = new WP_Query(array(
        'post__in' => $ids,
        'post_type' => array('last-news','blog'), 
        'paged' => $paged, 
        'posts_per_page' => 5,
    ));

}
return $query;
}

And this is the search.php:

<section class="content">
    <div class="page-title pad group">
        <h1>
        <?php if ( have_posts() ): ?><i class="fa fa-search"></i><?php endif; ?>
        <?php if ( !have_posts() ): ?><i class="fa fa-exclamation-circle"></i><?php endif; ?>
        <?php echo $wp_query->found_posts  ?>
        <?php _e('Search Results','theme'); ?>
        </h1>
    </div>

    <div class="pad group">

        <div class="notebox">
            <?php _e('Found','theme'); ?> "<span><?php echo get_search_query(); ?></span>".
            <?php if ( !have_posts() ): ?>
                <?php _e('Try with another term:','theme'); ?>
            <?php endif; ?>
            <div class="search-again">
                <?php get_search_form(); ?>
            </div>
        </div>

        <?php 
            if ( have_posts() ) : ?>

            <div class="post-list group">
                <?php $i = 1;  while ( have_posts() ): the_post(); 
                echo '<div class="post-row">';
                 get_template_part('content'); echo '</div>'; endwhile;  ?>
            </div><!--/.post-list-->

            <?php get_template_part('inc/pagination'); ?>

        <?php endif; ?>

    </div><!--/.pad-->

</section><!--/.content-->

The echo $wp_query->found_posts returns the number ‘100’ so it seems to be getting something but then the have_posts() functions returns a false value.

What am I doing wrong? I just want to return the posts in the $ids array whenever a search is done, I don’t need no other filter.

Read more here: Replacing search results with custom external query

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