Elasticsearch CRUD和批量操作

• 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"
}

• Update 指定 ID (先删除，在写入)

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

• 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"
    }
}

PUT 必须指定id；POST 则非必须指定id。

HTTP协议规定，POST方法修改资源状态时，URL指示的是该资源的父级资源，待修改资源的ID信息在请求体中携带。而PUT方法修改资源状态时，URL直接指示待修改资源。因此，同样是创建资源，重复提交POST请求可能产生两个不同的资源，而重复提交PUT请求只会对其URL中指定的资源起作用，也就是只会创建一个资源。

• 删除文档

DELETE users/_doc/1

• Bulk 操作

{ "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"
        }
    ]
}

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"]
            }
        }
    ]
}

• URI中指定index

GET /test2/_mget
{
    "docs" : [
        {

            "_id" : "1"
        },
        {

            "_id" : "3"
        }
    ]
}

• msearch 操作

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