|NO.Z.00028|——————————|BigDataEnd|——|Hadoop&ElasticSearch.V28|——|ELK.v28|集群|QueryDSL|文档批量操作.V1|

一、文档批量操作（bulk 和 mget）

### --- mget 批量查询

~~~     单条查询 GET /test_index/_doc/1，如果查询多个id的文档一条一条查询，网络开销太大。

GET /_mget
{
"docs" : [
{
"_index" : "book",
"_id" : 1
},
{
"_index" : "book",
"_id" : 2
}
]
}

~~~     # 输出结果

{
  "docs" : [
    {
      "_index" : "book",
      "_type" : "_doc",
      "_id" : "1",
      "_version" : 1,
      "_seq_no" : 0,
      "_primary_term" : 1,
      "found" : true,
      "_source" : {
        "name" : "lucene",
        "description" : "Lucene Core is a Java library providing powerful indexing and search features, as well as spellchecking, hit highlighting and advanced analysis/tokenization capabilities. The PyLucene sub project provides Python bindings for Lucene Core. ",
        "price" : 100.45,
        "timestamp" : "2021-11-21 19:11:35"
      }
    },
    {
      "_index" : "book",
      "_type" : "_doc",
      "_id" : "2",
      "_version" : 1,
      "_seq_no" : 1,
      "_primary_term" : 1,
      "found" : true,
      "_source" : {
        "name" : "solr",
        "description" : "Solr is highly scalable, providing fully fault tolerant distributed indexing, search and analytics. It exposes Lucenes features through easy to use JSON/HTTP interfaces or native clients for Java and other languages.",
        "price" : 320.45,
        "timestamp" : "2021-11-21 17:11:35"
      }
    }
  ]
}

### --- 同一索引下批量查询：

GET /book/_mget
{
"docs" : [
{
"_id" : 2
},
{
"_id" : 3
}
]
}

### --- 搜索简化写法

POST /book/_search
{
"query": {
"ids" : {
"values" : ["1", "4"]
}
}
}

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart

                                                                                                                                                   ——W.S.Landor

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