# Check for a document source

**HEAD /{index}/_source/{id}**

Check whether a document source exists in an index.
For example:

```
HEAD my-index-000001/_source/1
```

A document's source is not available if it is disabled in the mapping.

## Required authorization

* Index privileges: `read`


[External documentation](https://www.elastic.co/docs/reference/elasticsearch/mapping-reference/mapping-source-field)

## Servers
- http://api.example.com: http://api.example.com ()


## Authentication methods
- Api key auth


## Parameters

### Path parameters
- **index** (string)
  A comma-separated list of data streams, indices, and aliases.
  It supports wildcards (`*`).
- **id** (string)
  A unique identifier for the document.

### Query parameters
- **preference** (string)
  The node or shard the operation should be performed on.
  By default, the operation is randomized between the shard replicas.
- **realtime** (boolean)
  If `true`, the request is real-time as opposed to near-real-time.
- **refresh** (boolean)
  If `true`, the request refreshes the relevant shards before retrieving the document.
  Setting it to `true` should be done after careful thought and verification that this does not cause a heavy load on the system (and slow down indexing).
- **routing** (string)
  A custom value used to route operations to a specific shard.
- **_source** (boolean | string | array[string])
  Indicates whether to return the `_source` field (`true` or `false`) or lists the fields to return.
- **_source_excludes** (string | array[string])
  A comma-separated list of source fields to exclude in the response.
- **_source_includes** (string | array[string])
  A comma-separated list of source fields to include in the response.
- **version** (number)
  The version number for concurrency control.
  It must match the current version of the document for the request to succeed.
- **version_type** (string)
  The version type.

  Supported values include:
    - `internal`: Use internal versioning that starts at 1 and increments with each update or delete.
    - `external`: Only index the document if the specified version is strictly higher than the version of the stored document or if there is no existing document.
    - `external_gte`: Only index the document if the specified version is equal or higher than the version of the stored document or if there is no existing document.
  NOTE: The `external_gte` version type is meant for special use cases and should be used with care.
  If used incorrectly, it can result in loss of data.



## Responses
### 200



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