---
type: api
title: Resume a follower
description: Resume a cross-cluster replication follower index that was paused.
url: https://www.elastic.co/elastic/docs-builder/docs/4371/api/doc/elasticsearch/operation/operation-ccr-resume-follow
resource: https://www.elastic.co/elastic/docs-builder/docs/4371/api/doc/elasticsearch/operation/operation-ccr-resume-follow
products:
  - Elasticsearch
---

# Resume a follower

Availability: 6.5+

## Paths

- `POST` `/{index}/_ccr/resume_follow`

- [Api key auth](/elastic/docs-builder/docs/4371/api/doc/elasticsearch/authentication#apikeyauth)
- [Basic auth](/elastic/docs-builder/docs/4371/api/doc/elasticsearch/authentication#basicauth)
- [Bearer auth](/elastic/docs-builder/docs/4371/api/doc/elasticsearch/authentication#bearerauth)

#### Path Parameters

- `index` (string IndexName)
  Name of the follow index to resume following

## Description

Resume a cross-cluster replication follower index that was paused.
The follower index could have been paused with the pause follower API.
Alternatively it could be paused due to replication that cannot be retried due to failures during following tasks.
When this API returns, the follower index will resume fetching operations from the leader index.

[About cross-cluster replication](https://www.elastic.co/docs/deploy-manage/tools/cross-cluster-replication)

## Query String Parameters

- `master_timeout` (string Duration · default: 30s)
  Period to wait for a connection to the master node.

## Request Body

`application/json`

- `max_outstanding_read_requests` (number) — optional
- `max_outstanding_write_requests` (number) — optional
- `max_read_request_operation_count` (number) — optional
- `max_read_request_size` (string) — optional
- `max_retry_delay` (string Duration) — optional
- `max_write_buffer_count` (number) — optional
- `max_write_buffer_size` (string) — optional
- `max_write_request_operation_count` (number) — optional
- `max_write_request_size` (string) — optional
- `read_poll_timeout` (string Duration) — optional

## Response

`application/json`

- `acknowledged` (boolean)
  For a successful response, this value is always true. On failure, an exception is returned instead.
## Code Examples

#### Console

```console
POST /follower_index/_ccr/resume_follow
{
  "max_read_request_operation_count" : 1024,
  "max_outstanding_read_requests" : 16,
  "max_read_request_size" : "1024k",
  "max_write_request_operation_count" : 32768,
  "max_write_request_size" : "16k",
  "max_outstanding_write_requests" : 8,
  "max_write_buffer_count" : 512,
  "max_write_buffer_size" : "512k",
  "max_retry_delay" : "10s",
  "read_poll_timeout" : "30s"
}
```

#### JavaScript

```javascript
const response = await client.ccr.resumeFollow({
  index: "follower_index",
  max_read_request_operation_count: 1024,
  max_outstanding_read_requests: 16,
  max_read_request_size: "1024k",
  max_write_request_operation_count: 32768,
  max_write_request_size: "16k",
  max_outstanding_write_requests: 8,
  max_write_buffer_count: 512,
  max_write_buffer_size: "512k",
  max_retry_delay: "10s",
  read_poll_timeout: "30s",
});
```

#### Python

```python
resp = client.ccr.resume_follow(
    index="follower_index",
    max_read_request_operation_count=1024,
    max_outstanding_read_requests=16,
    max_read_request_size="1024k",
    max_write_request_operation_count=32768,
    max_write_request_size="16k",
    max_outstanding_write_requests=8,
    max_write_buffer_count=512,
    max_write_buffer_size="512k",
    max_retry_delay="10s",
    read_poll_timeout="30s",
)
```

#### curl

```curl
curl -X POST "$ELASTICSEARCH_URL/follower_index/_ccr/resume_follow" \
  -H "Authorization: ApiKey $ELASTIC_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "max_read_request_operation_count": 1024,
    "max_outstanding_read_requests": 16,
    "max_read_request_size": "1024k",
    "max_write_request_operation_count": 32768,
    "max_write_request_size": "16k",
    "max_outstanding_write_requests": 8,
    "max_write_buffer_count": 512,
    "max_write_buffer_size": "512k",
    "max_retry_delay": "10s",
    "read_poll_timeout": "30s"
  }'
```

#### Java

```java
client.ccr().resumeFollow(r -> r
    .index("follower_index")
    .maxOutstandingReadRequests(16L)
    .maxOutstandingWriteRequests(8L)
    .maxReadRequestOperationCount(1024L)
    .maxReadRequestSize("1024k")
    .maxRetryDelay(m -> m
        .time("10s")
    )
    .maxWriteBufferCount(512L)
    .maxWriteBufferSize("512k")
    .maxWriteRequestOperationCount(32768L)
    .maxWriteRequestSize("16k")
    .readPollTimeout(re -> re
        .time("30s")
    )
);
```

#### C#

```c#
var response = await client.CrossClusterReplication
    .ResumeFollowAsync(index: "follower_index", d1 => d1
        .MaxOutstandingReadRequests(16L)
        .MaxOutstandingWriteRequests(8L)
        .MaxReadRequestOperationCount(1024L)
        .MaxReadRequestSize("1024k")
        .MaxRetryDelay("10s")
        .MaxWriteBufferCount(512L)
        .MaxWriteBufferSize("512k")
        .MaxWriteRequestOperationCount(32768L)
        .MaxWriteRequestSize("16k")
        .ReadPollTimeout("30s")
    );
```

#### PHP

```php
$resp = $client->ccr()->resumeFollow([
    "index" => "follower_index",
    "body" => [
        "max_read_request_operation_count" => 1024,
        "max_outstanding_read_requests" => 16,
        "max_read_request_size" => "1024k",
        "max_write_request_operation_count" => 32768,
        "max_write_request_size" => "16k",
        "max_outstanding_write_requests" => 8,
        "max_write_buffer_count" => 512,
        "max_write_buffer_size" => "512k",
        "max_retry_delay" => "10s",
        "read_poll_timeout" => "30s",
    ],
]);
```

#### Ruby

```ruby
response = client.ccr.resume_follow(
  index: "follower_index",
  body: {
    "max_read_request_operation_count": 1024,
    "max_outstanding_read_requests": 16,
    "max_read_request_size": "1024k",
    "max_write_request_operation_count": 32768,
    "max_write_request_size": "16k",
    "max_outstanding_write_requests": 8,
    "max_write_buffer_count": 512,
    "max_write_buffer_size": "512k",
    "max_retry_delay": "10s",
    "read_poll_timeout": "30s"
  }
)
```

## Response Examples

#### Resume follow index response example1

A successful response from resuming a folower index.

```json
{
  "acknowledged" : true
}
```