---
title: Set processor
description: Sets one field and associates it with the specified value. If the field already exists, its value will be replaced with the provided one. This processor...
url: https://www.elastic.co/docs/reference/enrich-processor/set-processor
products:
  - Elasticsearch
---

# Set processor
Sets one field and associates it with the specified value. If the field already exists, its value will be replaced with the provided one.


| Name                 | Required | Default            | Description                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|----------------------|----------|--------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `field`              | yes      | -                  | The field to insert, upsert, or update. Supports [template snippets](https://www.elastic.co/docs/manage-data/ingest/transform-enrich/ingest-pipelines#template-snippets).                                                                                                                                                                                                                                                                          |
| `value`              | yes*     | -                  | The value to be set for the field. Supports [template snippets](https://www.elastic.co/docs/manage-data/ingest/transform-enrich/ingest-pipelines#template-snippets). May specify only one of `value` or `copy_from`.                                                                                                                                                                                                                               |
| `copy_from`          | no       | -                  | The origin field which will be copied to `field`, cannot set `value` simultaneously. Supported data types are `boolean`, `number`, `array`, `object`, `string`, `date`, etc.                                                                                                                                                                                                                                                                       |
| `override`           | no       | `true`             | If `true` processor will update fields with pre-existing non-null-valued field. When set to `false`, such fields will not be touched.                                                                                                                                                                                                                                                                                                              |
| `ignore_empty_value` | no       | `false`            | If `true` and used in combination with `value` which is a [template snippet](https://www.elastic.co/docs/manage-data/ingest/transform-enrich/ingest-pipelines#template-snippets) that evaluates to `null` or an empty string, the processor quietly exits without modifying the document. Similarly, if used in combination with `copy_from` it will quietly exit if the field does not exist or its value evaluates to `null` or an empty string. |
| `media_type`         | no       | `application/json` | The media type for encoding `value`. Applies only when `value` is a [template snippet](https://www.elastic.co/docs/manage-data/ingest/transform-enrich/ingest-pipelines#template-snippets). Must be one of `application/json`, `text/plain`, or `application/x-www-form-urlencoded`.                                                                                                                                                               |
| `description`        | no       | -                  | Description of the processor. Useful for describing the purpose of the processor or its configuration.                                                                                                                                                                                                                                                                                                                                             |
| `if`                 | no       | -                  | Conditionally execute the processor. See [Conditionally run a processor](https://www.elastic.co/docs/manage-data/ingest/transform-enrich/ingest-pipelines#conditionally-run-processor).                                                                                                                                                                                                                                                            |
| `ignore_failure`     | no       | `false`            | Ignore failures for the processor. See [Handling pipeline failures](https://www.elastic.co/docs/manage-data/ingest/transform-enrich/ingest-pipelines#handling-pipeline-failures).                                                                                                                                                                                                                                                                  |
| `on_failure`         | no       | -                  | Handle failures for the processor. See [Handling pipeline failures](https://www.elastic.co/docs/manage-data/ingest/transform-enrich/ingest-pipelines#handling-pipeline-failures).                                                                                                                                                                                                                                                                  |
| `tag`                | no       | -                  | Identifier for the processor. Useful for debugging and metrics.                                                                                                                                                                                                                                                                                                                                                                                    |

```js
{
  "description" : "sets the value of count to 1",
  "set": {
    "field": "count",
    "value": 1
  }
}
```

This processor can also be used to copy data from one field to another. For example:
```json

{
  "description": "sets the value of host.os.name from the field os",
  "processors": [
    {
      "set": {
        "field": "host.os.name",
        "value": "{{{os}}}"
      }
    }
  ]
}


{
  "docs": [
    {
      "_source": {
        "os": "Ubuntu"
      }
    }
  ]
}
```

Result:
```json
{
  "docs" : [
    {
      "doc" : {
        "_index" : "_index",
        "_id" : "_id",
        "_version" : "-3",
        "_source" : {
          "host" : {
            "os" : {
              "name" : "Ubuntu"
            }
          },
          "os" : "Ubuntu"
        },
        "_ingest" : {
          "timestamp" : "2019-03-11T21:54:37.909224Z"
        }
      }
    }
  ]
}
```

This processor can also access array fields using dot notation:
```json

{
  "pipeline": {
    "processors": [
      {
        "set": {
          "field": "my_field",
          "value": "{{{input_field.1}}}"
        }
      }
    ]
  },
  "docs": [
    {
      "_index": "index",
      "_id": "id",
      "_source": {
        "input_field": [
          "Ubuntu",
          "Windows",
          "Ventura"
        ]
      }
    }
  ]
}
```

Result:
```json
{
  "docs": [
    {
      "doc": {
        "_index": "index",
        "_id": "id",
        "_version": "-3",
        "_source": {
          "input_field": [
            "Ubuntu",
            "Windows",
            "Ventura"
          ],
          "my_field": "Windows"
        },
        "_ingest": {
          "timestamp": "2023-05-05T16:04:16.456475214Z"
        }
      }
    }
  ]
}
```

The contents of a field including complex values such as arrays and objects can be copied to another field using `copy_from`:
```json

{
  "description": "sets the value of bar from the field foo",
  "processors": [
    {
      "set": {
        "field": "bar",
        "copy_from": "foo"
      }
    }
  ]
}


{
  "docs": [
    {
      "_source": {
        "foo": ["foo1", "foo2"]
      }
    }
  ]
}
```

Result:
```json
{
  "docs" : [
    {
      "doc" : {
        "_index" : "_index",
        "_id" : "_id",
        "_version" : "-3",
        "_source" : {
          "bar": ["foo1", "foo2"],
          "foo": ["foo1", "foo2"]
        },
        "_ingest" : {
          "timestamp" : "2020-09-30T12:55:17.742795Z"
        }
      }
    }
  ]
}
```