elasticsearch index initialization and marvel operations (CRUD), batch query _mget, batch operations _bulk

The text is concise version using marvel operation

Plug-in installation tutorial marvel

https://blog.csdn.net/u013294097/article/details/100144725

You can do the initial operation of the index 1. Before creating the index,

For example, specify the number of shards, and the number of replicas

The correct syntax:

CURL -XPUT 'http://ip:port/library/' -d '{
   "settings":{
     "index":{
       "number_of_shards":5,
       "number_of_replicas":1
     }
   }
}'

Use marvel tool syntax

 

#---------------------------------
#初始化初始化索引
#创建索引之前可以对索引做初始化操作，比如指定shards数量以及replicas的数量

PUT http://localhost:9200/lilbrary/ 
{
  "settings":{
    "index":{
      "number_of_shards":5,
      "number_of_replicas":1
        }
    }
}

The above can be replaced by other number_of_replicas

blocks_read_only set to true, then the current index only allowed to read, write or update is not allowed

blocks_read set to true, disables reads

blocks_write set to true, the write operation is prohibited

blocks_metadata set to true, the prohibition of metadata operation

 

 

2. You can get detailed configuration information indexed by GET

GET /lilbrary/_settings

If the two indexes

GET /library1,library2/_settings

Get all the index information

GET /_all/_settings

More complete statement:

CURL -XGET 'http://ip:port/library/_settings'

CURL -XGET 'http://ip:port/library,library2/_settings'

CURL -XGET 'http://ip:port/_all/_settings'

3.API create, update, delete indexes

3.1 How to create an index with the API

例:curl -XPUT 'http://ip:port/twitter/tweet/1' -d '{"user":"kimchv","post_date":"2019-08-29T14:12:12","message":"trying out Elasticsearch"}'

Marvel of use cases:

Bring the new ID

PUT lilbrary/books/1
{
  "title":"Elasticsearch: The Definitive Guide",
  "name":{
    "first":"Zachary",
    "last":"Tong"
  },
  "publicsh_date":"2019-08-29",
  "price":"49.99"
}

POST without the ID (you can update, add, update, when the tape id)

POST /library/books/
{
  "title":"Elasticsearch : blueprints",
  "name":{
    "first":"Vineeth",
    "last":"Monan"
  },
  "publish_date":"2015-06-06",
  "price":"35.99"
}

 

How to update the index 3.2 API

例如：curl -XPOST 'http://ip:port/test/type1/1/_update' -d '{"script":"ctx._source.conter+=count","params":{"count":4}}'

Case Case with POST above, the above method is not recommended

Case 2:

通过 _update API的方式单独更新想要更新的
POST /library/books/1/_update
{
  "doc":{
    "price":"59.9"
    
  }
}

 

How to delete the index by 3.3 API

例：curl -XDELETE 'http://ip:port/twitter/tweet/1'

marvel Case:

DELETE /library/books/1

You can delete a TYPE

DELETE /library/books

Delete the entire index

DELETE /library

 

How to query Index 3.4

marvel way:

GET /library/books/1

Gets the specified field by _source, multi-field, or all of the information

GET /library/books/1?_source=title

GET /library/books/1?_source=title,price

GET /library/books/1?_source

4. batch query

4.1 general inquiry:

curl 'localhost:9200/_mget' -d{
  "docs":[
    {
      "_index":"library",
      "_type":"books",
      "_id":1,
      "_source":["keyword","keyword2"]
    },
    {
      "_index":"library",
      "_type":"books",
      "_id":8,
      "_source":"keyword"
    }
    ,
    {
      "_index":"library",
      "_type":"books",
      "_id":10,
      "_source":"keyword"
    }
    ]
}

marvel query:

GET /_mget
{
  "docs":[
    {
      "_index":"library",
      "_type":"books",
      "_id":1,
      "_source":["keyword","keyword2"]
    },
    {
      "_index":"library",
      "_type":"books",
      "_id":8,
      "_source":"keyword"
    }
    ,
    {
      "_index":"library",
      "_type":"books",
      "_id":10,
      "_source":"keyword"
    }
    ]
}

4.2 batch query _mget get a different ID documents of the same type under the same index

Normal mode:

方式1：
curl 'localhost:9200/library/books/_mget' -d
{
    "docs":[
        {"_id":6},
        {"_id":28}
    ]
}

方式2：
curl 'localhost:9200/library/books/_mget' -d
{
    "ids":["6","28"]
}

marvel way:

方式1：
GET /library/books/_mget
{
    "docs":[
        {"_id":6},
        {"_id":28}
    ]
}

方式2：
GET /library/books/_mget
{
    "ids":["6","28"]
}

The batch operation _bulk

In order to achieve create multiple documents, index, update, delete and use

The request body bulk format (landscaping not shown):

There are four action: create, index, update, delete

create: create it when a document does not exist.

index: create a new document or replace an existing document.

update: partial update the document.

delete: delete a document

{action:{metadata}}\n
{request body}\n
{action:{metadata}}\n
{request body}\n
...

例如：{"delete":{"_index":"library","_type":"books","_id":"1"}}

Example 1 (marvel mode):

POST /library/books/_bulk
{"index":{"_id":1}}
{"title":"Elasticsearch: The Definitive Guide","price":5}
{"index":{"_id":2}}
{"title":"The Elasticsearch cookbook","price":15}
{"index":{"_id":3}}
{"title":"Elasticsearch Blueprints","price":9}
{"index":{"_id":4}}
{"title":"Think in Python","price":22}
{"index":{"_id":5}}
{"title":"Thinking in Java","price":7}

Example 2 (marvel embodiment)

Next is the use of update, delete operation example

 POST /library/books/_bulk
{"delete":{"_index":"library","_type":"books","_id":"1"}}
{"create":{"_index":"music","_type":"classical","_id":"1"}}
{"title":"Ave Verum Corpus"}
{"index":{"_index":"music","_type":"classical"}}
{"title":"Litaniac de Venerabili Altaris Sacromento"}
{"update":{"_index":"library","_type":"books","_id":"2"}}
{"doc":{"price":"18"}}

5.2 bulk optimal value processing document size

Go to the actual testing environment, different hardware, different performance