"reason":"object mapping for [] tried to parse field [] as object, but found a concrete value"
使用java操作es，添加文档时，出现如下错误：
[{"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如下，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
}
}
}
}
}错误原因：
由于这个字段设计目的是为了存如下格式的数组：
{
"_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的语句类似如下示例：
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
此时如果执行此语句就会报错如下：
"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"}]
}