AJAX & Custom Fields WordPress Search

// ******************* Add custom fields to search ****************** //

function cf_search_join( $join ) {
    global $wpdb;

    if ( $_POST['keyword'] ) {
        $join .=' LEFT JOIN '.$wpdb->postmeta. ' ON '. $wpdb->posts . '.ID = ' . $wpdb->postmeta . '.post_id ';
    }

    return $join;
}
add_filter('posts_join', 'cf_search_join' );

function cf_search_where( $where ) {
    global $pagenow, $wpdb;

    if ( $_POST['keyword']) {
        $where = preg_replace(
            "/\(\s*".$wpdb->posts.".post_title\s+LIKE\s*(\'[^\']+\')\s*\)/",
            "(".$wpdb->posts.".post_title LIKE $1) OR (".$wpdb->postmeta.".meta_value LIKE $1)", $where );
    }

    return $where;
}
add_filter( 'posts_where', 'cf_search_where' );

function cf_search_distinct( $where ) {
    global $wpdb;

    if ( $_POST['keyword'] ) {
        return "DISTINCT";
    }

    return $where;
}
add_filter( 'posts_distinct', 'cf_search_distinct' );

// ******************* AJAX SEARCH ****************** //

add_action( 'wp_footer', 'ajax_fetch' );
function ajax_fetch() {
?>
<script type="text/javascript">
function fetch(){

    jQuery.ajax({
        url: '<?php echo admin_url('admin-ajax.php'); ?>',
        type: 'post',
        data: { action: 'data_fetch', keyword: jQuery('#s').val() },
        success: function(data) {
            jQuery('#search-results').html( data );
        }
    });

}
</script>

<?php
}

add_action('wp_ajax_data_fetch' , 'data_fetch');
add_action('wp_ajax_nopriv_data_fetch','data_fetch');

function data_fetch(){

    // projects loop

    $the_query = new WP_Query( array( 'posts_per_page' => -1, 's' => esc_attr( $_POST['keyword'] ), 'post_type' => array('projects')));
    if( $the_query->have_posts() ) {

        while( $the_query->have_posts() ): $the_query->the_post();

            // add loop

        endwhile;
        wp_reset_postdata();
    }


    die();
}