---
type: api
title: Check for a document source
description: Check whether a document source exists in an index.
url: https://www.elastic.co/elastic/docs-builder/docs/4371/api/doc/elasticsearch-serverless/operation/operation-exists-source
resource: https://www.elastic.co/elastic/docs-builder/docs/4371/api/doc/elasticsearch-serverless/operation/operation-exists-source
products:
  - Elasticsearch Serverless
---

# Check for a document source

Availability:

## Paths

- `HEAD` `/{index}/_source/{id}`

- [Api key auth](/elastic/docs-builder/docs/4371/api/doc/elasticsearch-serverless/authentication#apikeyauth)

#### Path Parameters

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

## Description

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`

[Learn more about _source field](https://www.elastic.co/docs/reference/elasticsearch/mapping-reference/mapping-source-field)

## Query String 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 · default: true)
  If `true`, the request is real-time as opposed to near-real-time.
- `refresh` (boolean · default: false)
  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` (union Routing)
  A custom value used to route operations to a specific shard.
  One of: `string` or `string[]`
- `_source` (union SourceConfigParam)
  Indicates whether to return the `_source` field (`true` or `false`) or lists the fields to return.
  One of: `boolean` or `Fields`
- `_source_excludes` (union Fields)
  A comma-separated list of source fields to exclude in the response.
  One of: `Field` or `Field[]`
- `_source_includes` (union Fields)
  A comma-separated list of source fields to include in the response.
  One of: `Field` or `Field[]`
- `version` (number VersionNumber)
  The version number for concurrency control.
It must match the current version of the document for the request to succeed.
- `version_type` (enum VersionType)
  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.
  Values: `internal`, `external`, `external_gte`

## Response

## Code Examples

#### Console

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

#### JavaScript

```javascript
const response = await client.existsSource({
  index: "my-index-000001",
  id: 1,
});
```

#### Python

```python
resp = client.exists_source(
    index="my-index-000001",
    id="1",
)
```

#### curl

```curl
curl "$ELASTICSEARCH_URL/my-index-000001/_source/1" \
  --head \
  -H "Authorization: ApiKey $ELASTIC_API_KEY"
```

#### Java

```java
client.existsSource(e -> e
    .id("1")
    .index("my-index-000001")
);
```

#### C#

```c#
var response = await client.ExistsSourceAsync(index: "my-index-000001", id: "1");
```

#### PHP

```php
$resp = $client->existsSource([
    "index" => "my-index-000001",
    "id" => "1",
]);
```

#### Ruby

```ruby
response = client.exists_source(
  index: "my-index-000001",
  id: "1"
)
```