"reason":"object mapping for [] tried to parse field [] as object, but found a concrete value"

使用java操做es，添加文档时，出现以下错误：

[{"type":"mapper_parsing_exception","reason":"object mapping for [enclosure_infor] tried to parse field [enclosure_infor] as object, but found a concrete value"}]

场景：

enclosure_infor这个字段的mapping以下，是个nested类型的：

"enclosure_infor": {
            "type": "nested",
            "properties": {
              "document": {
                "type": "text"
              },
              "enclosure": {
                "type": "keyword"
              },
              "link": {
                "type": "text",
                "fields": {
                  "keyword": {
                    "type": "keyword",
                    "ignore_above": 256
                  }
                }
              }
            }
          }

错误缘由：

因为这个字段设计目的是为了存以下格式的数组：

{
  "_index": "policy_document",
  "_type": "policy_document",
  "_id": "aaatest2",
  "_version": 1,
  "found": true,
  "_source": { "level": "国家", "enclosure_infor": [ { "document": "aaaaa", "link": "aa.link.com" }, { "document": "bbbbb", "link": "bb.link.com" } ] } }

在java中处理时，把这个字段的值转为json了：

List<Map<String,Object>> list = new ArrayList<>();
Map<String,Object> map = new HashedMap(8);
String base64Str = BinUtil.fileToBase64Str(filei);
map.put("enclosure",multipartFile.getOriginalFilename());
map.put("document",base64Str);
list.add(map);
String s = JSON.toJSONString(list, prettyFormat)

这样转换后的结果就是，最终post的语句相似以下示例：

POST policy_document/policy_document/aaatest/_create
{
    "level":"国家",
    "enclosure_infor":"[{\"document\":\"document0\",\"enclosure\":\"enclosure0\"}]",
    "plat_from":11,
    "reference_number":"国6",
    "title":"汪文档6",
    "id":"3331d0d5b1354424aaa2dd10232dd563",
    "_id_":"3331d0d5b1354424aaa2dd10232dd563",
    "launch_date":"2018-05-02",
    "launch_department":"国家统计局6"
}

注意这个字段的值，被转成这样了：

"enclosure_infor":"[{ 
 
   \"document\":\"document0\",\"enclosure\":\"enclosure0\"}]"

报错

此时若是执行此语句就会报错以下：

"reason":"object mapping for [] tried to parse field [] as object, but found a concrete value"

而正确的应该是这样的：

POST policy_document/policy_document/aaatest2/_create
{
  "level":"国家",
  "enclosure_infor":[
    {
  
  
   
   
            
   

  "document":"aaaaa","link":"aa.link.com"},
    {
  
  
   
   
            
   

  "document":"bbbbb","link":"bb.link.com"}]
}

解决方式

综合上面，能够看到，最终解决方式为，这个字段的值，应该是个list类型，而不是String类型，因此，把这个enclosure_infor的java类型改成List类型便可。

本文同步分享在 博客“IT云清”（CSDN）。
若有侵权，请联系 support@oschina.cn 删除。
本文参与“OSC源创计划”，欢迎正在阅读的你也加入，一块儿分享。