Store Json field as String in Elastic search?

Finally got it,if you want to store JSON as a string, without analyzing it, the mapping should be like this

"json_field": {    "type": "object",    "enabled" : false},

The enabled flag allows to disable parsing and indexing a named object completely. This is handy when a portion of the JSON document contains an arbitrary JSON which should not be indexed, nor added to the mapping.

Update - From ES version 7.12 "enabled" has been changed to "index".

As of today ElasticSearch 7.12 "enabled" is now "index".

So mapping should be like this:

"json_field": {    "type": "object",    "index" : false},

Solution

Set "enabled": false for the field.

curl -X PUT "localhost:9200/{{INDEX-NAME}}/_mapping/doc" -H 'Content-Type: application/json' -d'{    "properties" : {      "json_field" : {        "type" : "object",        "enabled": false      }    }}

Note: This cannot be applied to the existing field. Either pass it in mapping during the creation of index or you can always create a new field.

Explanation

The enabled setting, which can be applied only to the top-level mapping definition and to object fields, causes Elasticsearch to skip parsing of the contents of the field entirely. The JSON can still be retrieved from the _source field, but it is not searchable or stored in any other way:

Ref: Elasticsearch Docs