3.3-ES-CURD

• Tpye名, 约定都用doc

• Index - 如果ID不存在,创建新的文档; 否则,先删除现有的文档,再创建新的文档,版本会增加

• Create - 如果ID已经存在, 会失败

• Update - 文档必须已经存在,更新只会对相应字段做增量修改

批量操作-Bulk API

• 支持在一次API调用中,对不同的索引进行操作

• 支持四种类型操作

  • Index

  • Create

  • Update

  • Delete

• 可以在RUL中指定Index, 也可以在请求的Payload中进行

• 操作中单条操作失败,并不会影响其他操作

• 返回结果包括了每一条操作执行和结果

批量读取-megt

• 批量操作可以减少网络连接产生的开销, 提高性能

批量查询-msearch

常见错误返回

课程DEMO

############Create Document############
#create document. 自动生成 _id
POST users/_doc
{
    "user" : "Mike",
    "post_date" : "2019-04-15T14:12:12",
    "message" : "trying out Kibana"
}

#create document. 指定Id。如果id已经存在，报错
PUT users/_doc/1?op_type=create
{
    "user" : "Jack",
    "post_date" : "2019-05-15T14:12:12",
    "message" : "trying out Elasticsearch"
}

#create document. 指定 ID 如果已经存在，就报错
PUT users/_create/1
{
     "user" : "Jack",
    "post_date" : "2019-05-15T14:12:12",
    "message" : "trying out Elasticsearch"
}

### Get Document by ID
#Get the document by ID
GET users/_doc/1


###  Index & Update
#Update 指定 ID  (先删除，在写入)
GET users/_doc/1

PUT users/_doc/1
{
    "user" : "Mike"

}


#GET users/_doc/1
#在原文档上增加字段
POST users/_update/1/
{
    "doc":{
        "post_date" : "2019-05-15T14:12:12",
        "message" : "trying out Elasticsearch"
    }
}



### Delete by Id
# 删除文档
DELETE users/_doc/1


### Bulk 操作
#执行两次，查看每次的结果

#执行第1次
POST _bulk
{ "index" : { "_index" : "test", "_id" : "1" } }
{ "field1" : "value1" }
{ "delete" : { "_index" : "test", "_id" : "2" } }
{ "create" : { "_index" : "test2", "_id" : "3" } }
{ "field1" : "value3" }
{ "update" : {"_id" : "1", "_index" : "test"} }
{ "doc" : {"field2" : "value2"} }


#执行第2次
POST _bulk
{ "index" : { "_index" : "test", "_id" : "1" } }
{ "field1" : "value1" }
{ "delete" : { "_index" : "test", "_id" : "2" } }
{ "create" : { "_index" : "test2", "_id" : "3" } }
{ "field1" : "value3" }
{ "update" : {"_id" : "1", "_index" : "test"} }
{ "doc" : {"field2" : "value2"} }

### mget 操作
GET /_mget
{
    "docs" : [
        {
            "_index" : "test",
            "_id" : "1"
        },
        {
            "_index" : "test",
            "_id" : "2"
        }
    ]
}


#URI中指定index
GET /test/_mget
{
    "docs" : [
        {

            "_id" : "1"
        },
        {

            "_id" : "2"
        }
    ]
}


GET /_mget
{
    "docs" : [
        {
            "_index" : "test",
            "_id" : "1",
            "_source" : false
        },
        {
            "_index" : "test",
            "_id" : "2",
            "_source" : ["field3", "field4"]
        },
        {
            "_index" : "test",
            "_id" : "3",
            "_source" : {
                "include": ["user"],
                "exclude": ["user.location"]
            }
        }
    ]
}

### msearch 操作
POST kibana_sample_data_ecommerce/_msearch
{}
{"query" : {"match_all" : {}},"size":1}
{"index" : "kibana_sample_data_flights"}
{"query" : {"match_all" : {}},"size":2}


### 清除测试数据
#清除数据
DELETE users
DELETE test
DELETE test2

相关阅读

• Document API https://www.elastic.co/guide/en/elasticsearch/reference/7.1/docs.html