Elasticsearch批量获取文档

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elasticsearch批量获取文档

1. 使用es提供的Multi Get API实现

2. 获取指定的一系列id的文档列表

   
   #获取指定的一系列id的文档列表
   
   GET /_mget
   {
       "docs":[
       {
           "_index":"lib",
           "_type":"user",
           "_id":1
       },{
           "_index":"lib",
           "_type":"user",
           "_id":2
       },{
           "_index":"lib",
           "_type":"user",
           "_id":3
       }
       ]
   }
   
   
   #结果
   
   {
     "docs": [
       {
         "_index": "lib",
         "_type": "user",
         "_id": "1",
         "_version": 1,
         "found": true,
         "_source": {
           "first_name": "Jane",
           "last_name": "bill",
           "age": 18,
           "about": "I like to collect rock albums",
           "interests": [
             "music"
           ]
         }
       },
       {
         "_index": "lib",
         "_type": "user",
         "_id": "2",
         "_version": 1,
         "found": true,
         "_source": {
           "first_name": "Jane",
           "last_name": "tom",
           "age": 22,
           "about": "I like to collect rock albums",
           "interests": [
             "music"
           ]
         }
       },
       {
         "_index": "lib",
         "_type": "user",
         "_id": "3",
         "_version": 1,
         "found": true,
         "_source": {
           "first_name": "Jane",
           "last_name": "rose",
           "age": 18,
           "about": "I like to collect rock albums",
           "interests": [
             "music"
           ]
         }
       }
     ]
   }

3. 指定字段获取

   
   #指定字段获取
   
   GET /_mget
   {
       "docs":[
       {
           "_index":"lib",
           "_type":"user",
           "_id":1,
           "_source":"interests"
       },
       {
           "_index":"lib",
           "_type":"user",
           "_id":2,
           "_source":["age","interests"] 
       }
       ]
   }
   
   
   #结果
   
   {
     "docs": [
       {
         "_index": "lib",
         "_type": "user",
         "_id": "1",
         "_version": 1,
         "found": true,
         "_source": {
           "interests": [
             "music"
           ]
         }
       },
       {
         "_index": "lib",
         "_type": "user",
         "_id": "2",
         "_version": 1,
         "found": true,
         "_source": {
           "interests": [
             "music"
           ],
           "age": 22
         }
       }
     ]
   }

4. 获取同索引类型下的不同文档

   GET /lib/user/_mget
   {
       "docs":[
       {
           "_id":1
       },{
           "_type":"user",
           "_id":2
       }
       ]
   }
   
   
   #结果
   
   {
     "docs": [
       {
         "_index": "lib",
         "_type": "user",
         "_id": "1",
         "_version": 1,
         "found": true,
         "_source": {
           "first_name": "Jane",
           "last_name": "bill",
           "age": 18,
           "about": "I like to collect rock albums",
           "interests": [
             "music"
           ]
         }
       },
       {
         "_index": "lib",
         "_type": "user",
         "_id": "2",
         "_version": 1,
         "found": true,
         "_source": {
           "first_name": "Jane",
           "last_name": "tom",
           "age": 22,
           "about": "I like to collect rock albums",
           "interests": [
             "music"
           ]
         }
       }
     ]
   }
   
   
   #简化
   
   GET /lib/user/_mget
   {
       "ids":["1","2"]
   }