Elasticsearch Document

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Document in Elasticsearch

Overview

A document is simply a json document that is stored in Elasticsearch index. It consists of one or more fields; where each field has its own data type. This field type defines the type of data that can be stored in the field such as integer, string, object. Document is schema-free, which means we do not require to specify schema before indexing document, when a field is indexed for the first time, its type is decided and set.

Examples:

Creating A document : to create a document in the users index.

POST  /users/_doc 
{
    "name" : "Petey",
    "lastname" : "Cruiser",
    "email" : "petey@gmail.com"
}

In the above request, we haven’t mentioned id for the document so index operation generates a unique ID for the document. Here _doc is the type of document. We can provide this type to user-defined type also where user index may store user type document.

POST  /users/_doc/1
{
    "name" : "Petey",
    "lastname" : "Cruiser",
    "email" : "petey@gmail.com"
}

In the above query, the document will be created with id 1.

You can use the below ‘GET’ query to get a document from the index using id

GET  /users/_doc/1

Bellow is the result containing the document (in _source field) with metadata:-

{
    "_index": "users",
    "_type": "_doc",
    "_id": "1",
    "_version": 1,    "_seq_no": 1,    "_primary_term": 1,
    "found": true,
    "_source": {
        "name": "Petey",
        "lastname": "Cruiser",
        "email": "petey@gmail.com"
    }
}
Notes

Starting version 7.0 types are deprecated, so for backward compatibility on version 7.x all docs are under type ‘_doc’, starting 8.x type will be completely removed from ES APIs


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