자동 완성 후보가 좁혀지지 않음 (autocomplete jQuery UI ajax)

<div class="col-sm-3 mb-5">
   <input id="検索" type="text" class="form-control" placeholder="検索">
</div>
<script>
$("#検索").autocomplete({
minLength: 1,
source: function (request, response) {
$.ajax({
  url: "{% url  'search_ajax' %}",      
  dataType: "json",
  type: "POST",
  success: function (data) {
                  data=JSON.parse(data);           
                  response($.map(data, function (obj) {              
                  return {
                          label: obj.顧客__姓,
                           value: obj.顧客__姓,
                  };
   }));
   }
</script>