Elasticsearch - How to add new field to existing document by update by query

     Elasticsearch: Backfill old documents with email

 

 

You can use the update by query API in order to add a new field to all your existing documents:

POST index/_update_by_query

{

  "script": {

    "source": "ctx._source.email = 'rohitpatel0105@gmail.com'",

    "lang": "painless"

  },

  "query": {

    "bool": {

      "must_not": [

        {

          "exists": {

            "field": "email"

          }

        }

      ]

    }

  }

}