Index API | Elasticsearch Index APIs - elasticsearch - elasticsearch tutorial - elastic search


Elasticsearch Index APIs

  • The Index APIs are in charge of dealing with every one of the parts of list like settings, nom de plumes, mappings, file formats.
Index API

Create Index

  • This API helps you to create index. Index can be created automatically when a user is passing JSON objects to any index or it can be created before that.
  • To create an index, you just need to send a post request with settings, mappings and aliases or just a simple request without body.
    • learn elasticsearch tutorials - search data - indexes

    learn elasticsearch tutorials - search data - indexes Example

    For example 
POST http://localhost:9200/colleges
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Response 

{"acknowledged":true}
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  • Or, with some settings 
POST http://localhost:9200/colleges
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Request Body 

{
   "settings" : {
      "index" : {
         "number_of_shards" : 5, "number_of_replicas" : 3
      }
   }
}
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Response 

{"acknowledged":true}
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  • Or with mapping 
POST http://localhost:9200/colleges
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Request Body 

{
   "settings" : {
      "number_of_shards" : 3
   },
	
   "mappings" : {
      "type1" : {
         "_source" : { "enabled" : false }, "properties" : {
            "college_name" : { "type" : "string" }, "college type" : {"type":"string"}
         }
      }
   }
}
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Response 

{"acknowledged":true}
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  • Or, with alias 
POST http://localhost:9200/colleges
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Request Body 

{
   "aliases" : {
      "alias_1" : {}, "alias_2" : {
         "filter" : {
            "term" : {"user" : "manu" }
         },
         "routing" : "manu"
      }
   }
}
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Response 

{"acknowledged":true}
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Delete Index

  • This API helps you to delete any index. You just need to pass a delete request with the URL of that particular Index. For example,
DELETE http://localhost:9200/colleges
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  • You can delete all indices by just using _all,*.
Delete Index

Get Index

  • This API can be called by just sending get request to one or more than one indices. This returns the information about index.
GET http://localhost:9200/schools
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Response 

{
   "schools":{
      "aliases":{}, "mappings":{
         "school":{
            "properties":{
               "city":{"type":"string"}, "description":{"type":"string"},
               "fees":{"type":"long"}, "location":{"type":"double"},
               "name":{"type":"string"}, "rating":{"type":"string"},
               "state":{"type":"string"}, "street":{"type":"string"},
               "tags":{"type":"string"}, "zip":{"type":"string"}
            }
         }
      },
		
      "settings":{
         "index":{
            "creation_date":"1454409831535", "number_of_shards":"5",
            "number_of_replicas":"1", "uuid":"iKdjTtXQSMCW4xZMhpsOVA",
            "version":{"created":"2010199"}
         }
      },
      "warmers":{}
   }
}
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  • You can get the information of all the indices by using _all or *.

Index Exist

  • Existence of an index can be determined by just sending a get request to that index. If the HTTP response is 200, it exists; if it is 404, it does not exist.
  • It’s very easy to close or open one or more index by just adding _close or _open in post to request to that index. For example,
POST http://localhost:9200/schools/_close
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    Or
POST http://localhost:9200/schools/_open
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Index Aliases

  • This API helps to give an alias to any index by using _aliases keyword. Single alias can be mapped to more than one and alias cannot have the same name as index. For example,
POST http://localhost:9200/_aliases
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Request Body 

{
   "actions" : [
      { "add" : { "index" : "schools", "alias" : "schools_pri" } }
   ]
}
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Response 

{"acknowledged":true}
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    Then,
GET http://localhost:9200/schools_pri
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Response 

{"schools":{"aliases":{"schools_pri":{}},"}}
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Index Settings

  • You can get the index settings by just appending _settings keyword at the end of URL. For example,
GET http://localhost:9200/schools/_settings
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Index setting

Response 

{
   "schools":{
      "settings":{
         "index":{
            "creation_date":"1454409831535", "number_of_shards":"5", 
            "number_of_replicas":"1", "uuid":"iKdjTtXQSMCW4xZMhpsOVA", 
            "version":{"created":"2010199"}
        }
      }
   }
}
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Analyze

  • This API helps to analyze the text and send the tokens with offset value and data type. For example,
POST http://localhost:9200/_analyze
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Request Body 

{
   "analyzer" : "standard",
   "text" : "you are reading this at tutorials point"
}
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Response 

{
   "tokens":[
      {"token":"you", "start_offset":0, "end_offset":3, "type":"<ALPHANUM>", "position":0},
      {"token":"are", "start_offset":4, "end_offset":7, "type":"<ALPHANUM>", "position":1},
      {"token":"reading", "start_offset":8, "end_offset":15, "type":"<ALPHANUM>", "position":2},
      {"token":"this", "start_offset":16, "end_offset":20, "type":"<ALPHANUM>", "position":3},
      {"token":"at", "start_offset":21, "end_offset":23, "type":"<ALPHANUM>", "position":4},
      {"token":"tutorials", "start_offset":24, "end_offset":33, "type":"<ALPHANUM>", "position":5},
      {"token":"point", "start_offset":34, "end_offset":39, "type":"<ALPHANUM>", "position":6}
   ]
}
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  • You can also analyze a text with any index, and then the text will be analyzed according to the analyzer associated with that index.

Index Templates

  • You can also create index templates with mappings, which can be applied to new indices. For example,
POST http://localhost:9200/_template/template_a
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Request Body 

{
   "template" : "tu*", 
      "settings" : {
         "number_of_shards" : 3
   },
	
   "mappings" : {
      "chapter" : {
         "_source" : { "enabled" : false }
      }
   }
}
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  • Any index that starts with “tu” will have the same settings as template_a.

Index Stats

  • This API helps you to extract statistics about a particular index. You just need to send a get request with the index URL and _stats keyword at the end.
    • learn elasticsearch tutorials - elasticsearch clusters indexers

    learn elasticsearch tutorials - elasticsearch clusters indexers Example

GET http://localhost:9200/schools/_stats
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Response 

{"_shards":{"total":10, "successful":5, "failed":0}, "_all":{"primaries":{"docs":{
   "count":3, "deleted":0}}}, "store":{"size_in_bytes":16653, "throttle_time_in_millis":0},
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  • This API helps to clean the data from index memory and migrate it to index storage and also cleans internal transaction log. For example,
GET http://localhost:9200/schools/_flush
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Response 

{"_shards":{"total":10, "successful":5, "failed":0}}
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Refresh

  • Refresh is scheduled by default in Elastic search, but you can refresh one or more indices explicitly by using _refresh. For example,
GET http://localhost:9200/schools/_refresh
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Response 

{"_shards":{"total":10, "successful":5, "failed":0}}
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