OpenSearch/docs/reference/ccr/apis/follow/put-follow.asciidoc

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[role="xpack"]
[testenv="platinum"]
[[ccr-put-follow]]
=== Create follower API
++++
<titleabbrev>Create follower</titleabbrev>
++++
beta[]
Creates a follower index.
==== Description
This API creates a new follower index that is configured to follow the
referenced leader index. When this API returns, the follower index exists, and
{ccr} starts replicating operations from the leader index to the follower index.
==== Request
//////////////////////////
[source,js]
--------------------------------------------------
POST /follower_index/_ccr/pause_follow
--------------------------------------------------
// CONSOLE
// TEARDOWN
//////////////////////////
[source,js]
--------------------------------------------------
PUT /<follower_index>/_ccr/follow
{
"remote_cluster" : "<remote_cluster>",
"leader_index" : "<leader_index>"
}
--------------------------------------------------
// CONSOLE
// TEST[setup:remote_cluster_and_leader_index]
// TEST[s/<follower_index>/follower_index/]
// TEST[s/<remote_cluster>/remote_cluster/]
// TEST[s/<leader_index>/leader_index/]
==== Path Parameters
`follower_index` (required)::
(string) the name of the follower index
==== Request Body
`remote_cluster` (required)::
(string) the <<modules-remote-clusters,remote cluster>> containing the leader
index
`leader_index` (required)::
(string) the name of the index in the leader cluster to follow
include::../follow-request-body.asciidoc[]
==== Authorization
If the {es} {security-features} are enabled, you must have `write`, `monitor`,
and `manage_follow_index` 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].
==== Example
This example creates a follower index named `follower_index`:
[source,js]
--------------------------------------------------
PUT /follower_index/_ccr/follow
{
"remote_cluster" : "remote_cluster",
"leader_index" : "leader_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"
}
--------------------------------------------------
// CONSOLE
// TEST[setup:remote_cluster_and_leader_index]
The API returns the following result:
[source,js]
--------------------------------------------------
{
"follow_index_created" : true,
"follow_index_shards_acked" : true,
"index_following_started" : true
}
--------------------------------------------------
// TESTRESPONSE