WordPress autocomplete search with taxonomies

Ok I got it!

That’s the code for my search-results.php

<?php 
include('../../../wp-load.php');

$term=$_GET["term"]; 

$json=array();

$terms = get_terms( 'produits' );
 if ( ! empty( $terms ) && ! is_wp_error( $terms ) ){
     foreach ( $terms as $term ) {
       $json[]=array( 'value'=> $term->name );
     }
 }
    echo json_encode($json);
?>

Thanks milo for your help ! I needed to use get_terms !