elasticsearch ID对于类型或索引必须是唯一的吗？

Question

Elasticsearch允许你存储_type与一起_index.我想知道我是否应该提供自己的,_id如果它在整个索引中是独一无二的吗？

Answer 1

它应该是独一无二的

PUT so
PUT /so/t1/1
{}
PUT /so/t2/1
{}
GET /so/_search

{
   "took": 1,
   "timed_out": false,
   "_shards": {
      "total": 5,
      "successful": 5,
      "failed": 0
   },
   "hits": {
      "total": 2,
      "max_score": 1,
      "hits": [
         {
            "_index": "so",
            "_type": "t2",
            "_id": "1",
            "_score": 1,
            "_source": {}
         },
         {
            "_index": "so",
            "_type": "t1",
            "_id": "1",
            "_score": 1,
            "_source": {}
         }
      ]
   }
}

原因是:你不会通过索引知道doctype来获取文档,并且使用索引范围的查询查询ES将返回包括其类型和索引的文档.