[role="xpack"]
[testenv="platinum"]
[[ccr-post-resume-follow]]
=== Resume follower API
++++
<titleabbrev>Resume follower</titleabbrev>
++++

Resumes a follower index.

[[ccr-post-resume-follow-request]]
==== {api-request-title}

//////////////////////////

[source,console]
--------------------------------------------------
PUT /follower_index/_ccr/follow?wait_for_active_shards=1
{
  "remote_cluster" : "remote_cluster",
  "leader_index" : "leader_index"
}

POST /follower_index/_ccr/pause_follow
--------------------------------------------------
// TESTSETUP
// TEST[setup:remote_cluster_and_leader_index]

[source,console]
--------------------------------------------------
POST /follower_index/_ccr/pause_follow
--------------------------------------------------
// TEARDOWN

//////////////////////////

[source,console]
--------------------------------------------------
POST /<follower_index>/_ccr/resume_follow
{
}
--------------------------------------------------
// TEST[s/<follower_index>/follower_index/]
// TEST[s/<remote_cluster>/remote_cluster/]
// TEST[s/<leader_index>/leader_index/]

[[ccr-post-resume-follow-prereqs]]
==== {api-prereq-title}

* If the {es} {security-features} are enabled, you must have `write` and `monitor`
index privileges for the follower index. You must have `read` and `monitor`
index privileges for the leader index. You must also have `manage_ccr` cluster
privileges on the cluster that contains the follower index. For more information,
see {stack-ov}/security-privileges.html[Security privileges].

[[ccr-post-resume-follow-desc]]
==== {api-description-title}

This API resumes a follower index that has been paused either explicitly with
the <<ccr-post-pause-follow, pause follower API>> or implicitly due to
execution that can not be retried due to failure during following. When this API
returns, the follower index will resume fetching operations from the leader index.

[[ccr-post-resume-follow-path-parms]]
==== {api-path-parms-title}

`<follower_index>`::
  (Required, string) The name of the follower index.

[[ccr-post-resume-follow-request-body]]
==== {api-request-body-title}
include::../follow-request-body.asciidoc[]

[[ccr-post-resume-follow-examples]]
==== {api-examples-title}

This example resumes a follower index named `follower_index`:

[source,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"
}
--------------------------------------------------

The API returns the following result:

[source,console-result]
--------------------------------------------------
{
  "acknowledged" : true
}
--------------------------------------------------