$wp_query = new WP_Query( array(
                    'ep_integrate'   => true,
                    'post_type'      => 'post',
                    'posts_per_page' => 20,
                    'tax_query' => array(
                        array(
                            'taxonomy' => 'category',
                            'terms'    => array( get_query_var('cat') ),
                            'field'    => 'term_id',
                        ),
                    ),
                ) );


                if ( $wp_query->have_posts() ) {

                    // Start the loop.
                    while ( $wp_query->have_posts() ) : $wp_query->the_post();

                        /**
                         * Run the loop for the search to output the results.
                         * If you want to overload this in a child theme then include a file
                         * called content-search.php and that will be used instead.
                         */
                        get_template_part('template-parts/content', 'search');

                        // End the loop.
                    endwhile;

                    // Previous/next page navigation.
                    the_posts_pagination(array(
                        'prev_text' => __('Previous page', 'twentysixteen'),
                        'next_text' => __('Next page', 'twentysixteen'),
                        'before_page_number' => '<span class="meta-nav screen-reader-text">' . __('Page', 'twentysixteen') . ' </span>',
                    ));

                    wp_reset_postdata();

                    // If no content, include the "No posts found" template.
                } else {

                    get_template_part('template-parts/content', 'none');
                }

function elasticpress_search( $wp_query ) {
    if ( is_search()  ) {
        $query->set( 'ep_integrate', true ); }
}

add_action( 'pre_get_posts', 'elasticpress_search' );