Javascript MarkLogicearch.suggest不返回任何值

我正在try 使用earch.suggest根据我数据库中的多范围索引向我返回一些建议.到目前为止，我已经try 了单个字符串元素范围索引，但我想我找不出正确的语法.

const search = require('/MarkLogic/appservices/search/search');
const options = 
fn.head(xdmp.unquote('<search:options xmlns:search="http://marklogic.com/appservices/search">' +
 '<default-suggestion-source>' +
   '<range collation="http://marklogic.com/collation//S1" type="xs:string">' +
      '<json-property>title</json-property>' +
   '</range>' +
 '</default-suggestion-source>' +
'</search:options>')).root;
search.suggest("Taiw", options)

I've changed a bit a code snippet from here: https://docs.marklogic.com/10.0/search.suggest but it does not produce any results:

I have element range index in my database with data

我还try 使用JSON:

const search = require('/MarkLogic/appservices/search/search');
const options = {
  "search:options":{
   "default-suggestion-source":{
      "range":{
         "range":{
            "type":"xs:string",
            "collation":"http://marklogic.com/collation//S1",
            "element":{
               "name":"title"
            }
         }
      }
   }
}}
search.suggest("Taiw", options)

但我最后得到的是:

[JavaScript] XDMP-AS:(err:XPTY0004)$options as elements(search:options)？--无效强制: 目标 node {"搜索:选项":目标 node {"默认建议-源":目标 node {...} as元素(搜索:选项)

我做错了什么？我的数据库需要设置什么设置吗？我使用的是JSON数据