Question

我尝试了一个小例子

我创建了一个映射

PUT /company
{
  "mappings": {
    "country": {},
    "branch": {
        "_parent": {
           "type": "country"
        }
    },
    "employee": {
        "_parent": {
            "type": "branch" 
        }
    }
  }
}

并添加一些项目

POST /company/country/_bulk
{"index": {"_id": "countryA"}}
{"name": "0001"}
{"index": {"_id": "countryB"}}
{"name": "0008"}
{"index": {"_id": "countryC"}}
{"name": "0015"}

POST /company/branch/_bulk
{ "index": { "_id": "branchA", "parent": "countryA" }}
{ "name": "0002" }
{ "index": { "_id": "branchB", "parent": "countryA" }}
{ "name": "0005" }
{ "index": { "_id": "branchA", "parent": "countryB" }}
{ "name": "0009" }
{ "index": { "_id": "branchB", "parent": "countryB" }}
{ "name": "0012" }
{ "index": { "_id": "branchA", "parent": "countryC" }}
{ "name": "0016" }
{ "index": { "_id": "branchB", "parent": "countryC" }}
{ "name": "0019" }

但是，然后我运行请求

GET /company/branch/_search

结果只有4项分支

{
   "took": 2,
   "timed_out": false,
   "_shards": {
      "total": 5,
      "successful": 5,
      "failed": 0
   },
   "hits": {
      "total": 4,
      "max_score": 1,
      "hits": [
         {
            "_index": "company",
            "_type": "branch",
            "_id": "branchA",
            "_score": 1,
            "_routing": "countryC",
            "_parent": "countryC",
            "_source": {
               "name": "0016"
            }
         },
         {
            "_index": "company",
            "_type": "branch",
            "_id": "branchB",
            "_score": 1,
            "_routing": "countryC",
            "_parent": "countryC",
            "_source": {
               "name": "0019"
            }
         },
         {
            "_index": "company",
            "_type": "branch",
            "_id": "branchA",
            "_score": 1,
            "_routing": "countryB",
            "_parent": "countryB",
            "_source": {
               "name": "0009"
            }
         },
         {
            "_index": "company",
            "_type": "branch",
            "_id": "branchB",
            "_score": 1,
            "_routing": "countryB",
            "_parent": "countryB",
            "_source": {
               "name": "0012"
            }
         }
      ]
   }
}

为什么，失去对国家A-branchA＆amp; countryA-branchB吗

ps：我有时会再试一次，可能是countryA与countryB冲突

Answer 1

你失败的原因＆＃39;文档是因为您为多个文档提供了相同的_id。在Elasticsearch中，文档ID是唯一的，当您使用相同的文档ID插入两个文档时，第二个插入将覆盖并更新第一个记录。

如果您执行GET /company/branch/branchA，您将能够看到该文档_version大于1。

要解决此问题，只需删除_id属性，让Elasticsearch自动生成ID，或为每个文档选择唯一的文档ID。

Answer 2

在这种情况下，Elasticsearch会丢失具有相同_id和相同_parent的记录（记录由_id + _parent标识）。
如果没有_parent（分支），则仅使用_id字段来标识记录。

为什么elasticsearch在索引后丢失了项目？

2 个答案: