简介

为了能更快的同时检索多个文档
mget API参数是一个docs数组,数组的每个节点定义一个文档的_index,_type,_id元数据

image.png

我们先创建出一些数据,然后我们看下

  1. GET /library/books/1
  2. GET /library/books/2
  3. GET /library/books/3
  5. GET /shakespeare/line/1
  6. GET /shakespeare/line/2
  7. GET /shakespeare/line/3

一起获取下

  1. # 数组[]
  2. GET /_mget
  3. {
  4.   "docs": [
  5.       {
  6.         "_index": "library",
  7.         "_type": "books",
  8.         "_id": 1
  9.       },
  10.       {
  11.         "_index": "library",
  12.         "_type": "books",
  13.         "_id": 2
  14.       },
  15.       {
  16.         "_index": "library",
  17.         "_type": "books",
  18.         "_id": 3
  19.       },
  20.       {
  21.         "_index": "shakespeare",
  22.         "_type": "line",
  23.         "_id": 1
  24.       },
  25.       {
  26.         "_index": "shakespeare",
  27.         "_type": "line",
  28.         "_id": 2
  29.       },
  30.       {
  31.         "_index": "shakespeare",
  32.         "_type": "line",
  33.         "_id": 3
  34.       }
  35.     ]
  36. }

可以指定你想获取的字段

  1. # 也可以指定_source字段,获取你想要的
  2. GET /_mget
  3. {
  4.   "docs": [
  5.       {
  6.         "_index": "library",
  7.         "_type": "books",
  8.         "_id": 1,
  9.         "_source": "title"
  10.       },
  11.       {
  12.         "_index": "library",
  13.         "_type": "books",
  14.         "_id": 2,
  15.         "_source": "name"
  16.       },
  17.       {
  18.         "_index": "library",
  19.         "_type": "books",
  20.         "_id": 3,
  21.         "_source": "price"
  22.       },
  23.       {
  24.         "_index": "shakespeare",
  25.         "_type": "line",
  26.         "_id": 1,
  27.         "_source": "name"
  28.       },
  29.       {
  30.         "_index": "shakespeare",
  31.         "_type": "line",
  32.         "_id": 2,
  33.         "_source": ["name","password"]
  34.       },
  35.       {
  36.         "_index": "shakespeare",
  37.         "_type": "line",
  38.         "_id": 3,
  39.         "_source": "password"
  40.       }
  41.     ]
  42. }

获取相同index相同type下不同ID的文档

  1. GET /library/books/_mget
  2. {
  3.   "docs": [
  4.       {"_id": 1},
  5.       {"type":"books","_id":3}
  6.     ]
  7. }

可以这样简便的写

  1. GET /library/books/_mget
  2. {
  3.   "ids": ["1", "3"]
  4. }