Elasticsearch Metadata

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Metadata in Elasticsearch

What it is

Metadata is information about the data. In Elasticsearch, each document has associated metadata such as _id and _index meta fields.

Examples
  • Routing meta field:
    • _routing, a routing value that places a document in a particular shard.
  • Other meta field
    • _meta, not used by Elasticsearch but can be used to store application-specific metadata.
PUT index_01
{
  "mappings": {
    "_meta": { 
      "class": "App01::User01",
      "version": "01"
    }
  }
}

  • Identity meta fields: 
    _id , the id of the document, for example querying based on _id field
PUT index01/_doc/1
{
  "text": "Document with ID 1"
}
 
PUT index01/_doc/2
{
  "text": "Document with ID 2"
}
 
GET index01/_search
{
  "query": {
    "terms": {
      "_id": [ "1", "2" ] 
    }
  }
}

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