【Elasticsearch】Indices APIs

1、Bulk API

https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-bulk.html

The bulk API makes it possible to perform many index/delete operations in a single API call. This can greatly increate the indexing speed.

The REST API endpoint is /_bulk ,and it expects the following JSON structure:

actiion_and_meta_data\n
optional_source\n
actiion_and_meta_data\n
optional_source\n
...
...
actiion_and_meta_data\n
optional_source\n

The possible actions are index,create,delete and update.

2、Put Mapping

https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-put-mapping.html

Put Mapping API 可以讓你爲存在的Index建立新的Type，或是爲存在的Type建立新的Fields。(The Put mapping API allows you to add a new type on an existing index,or new fields to an existing type)

curl -XPUT 'http://localhost:9200/twitter' -d '{       
  "mappings": {
    "tweet": {
      "properties": {
        "message": {
          "type": "string"
        }
      }
    }
  }
}'                            ==> 建立Index：twitter，建立Type：tweet，建立Fields：message

curl -XPUT 'http://localhost:9200/twitter/_mapping/tweet' -d '{
  "properties": {
    "user_name": {
      "type": "string"
    }
  }
}'                            ==> 爲Type：tweet，新增Fields：user_name

curl -XPUT 'http://localhost:9200/twitter/_mapping/user' -d '{
  "properties": {
    "name": {
      "type": "string"
    }
  }
}'                            ==> 爲Index：twitter，新增Type：user，和新的Fields：name

Multi-Index：

curl -XPUT 'http://localhost:9200/my_index' -d '{
  "mappings": {
    "user": {
      "properties": {
        "name": {
          "properties": {
            "first": {
              "type": "string"
            }
          }
        },
        "user_id": {
          "type": "string",
          "index": "not_analyzed"
        }
      }
    }
  }
}'                ==>建立Index：my_index，並擁有一個Type：user。Type：user擁有兩個Fields：name，first


curl -XPUT 'http://localhost:9200/my_index/_mapping/user' -d '{
  "properties": {
    "name": {
      "properties": {
        "last": {                ==> 在存在的Fields新增properties
          "type": "string"
        }
      }
    },
    "user_id": {
      "type": "string",
      "index": "not_analyzed",
      "ignore_above": 100        ==> 更新原有的ignore_above從0到100
    }
  }
}'               ==>

3、Index Templates

https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-templates.html

Index Templates 當你定義了一個template。新的indx建立時候，只有匹配到template的pattern string。該template的settings，mappings，alias定義就會被應用到新建立的index上。(Index Templates allow you to define templates that will automatically be applied when new indices are created.The templates include both settings and mappings and a simple pattern template that controls whether the templates should be applied to the new index.)

Note: Templates are only applied at index creation time.Changing a template will have no impact on existsing indices.

curl -XPUT 'localhost:9200/_template/template_1' -d 
'{
  "template": "te*",        ==> pattern
  "mappings": {
    "type1": {
      "_source": {
        "enabled": false
      },
      "properties": {
        "host_name": {
          "type": "string",
          "index": "not_analyzed"
        },
        "create_at": {
          "type": "date",
          "format": "EEE MMM dd HH:mm:ss Z YYYY"
        }
      }
    }
  }
}'        ==> Define a template named template_1,with a template pattern of te*.The mappings will be applied to any index name that matches the te* template

Multiple Template Matching:

Multiple index templates can potentially match an index,in this case,both the settting and mappings are merged into the final ocnfiguration of the index.The order of the merging can be controlled useing order parameter,with lower order being applied first, and higher orders overriding them.

curl -XPUT localhost:9200/_template/template_1 -d '{
    "template" : "*",
    "order" : 0,
    "settings" : {
        "number_of_shards" : 1
    },
    "mappings" : {
        "type1" : {
            "_source" : { "enabled" : false }
        }
    }}'

curl -XPUT localhost:9200/_template/template_2 -d '{
    "template" : "te*",
    "order" : 1,
    "settings" : {
        "number_of_shards" : 1
    },
    "mappings" : {
        "type1" : {
            "_source" : { "enabled" : true }
        }
    }}'