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>
++++
Creates a follower index.
[[ccr-put-follow-request]]
==== {api-request-title}
//////////////////////////
[source,console]
--------------------------------------------------
POST /follower_index/_ccr/pause_follow
--------------------------------------------------
// TEARDOWN
//////////////////////////
[source,console]
--------------------------------------------------
PUT /<follower_index>/_ccr/follow?wait_for_active_shards=1
{
"remote_cluster" : "<remote_cluster>",
"leader_index" : "<leader_index>"
}
--------------------------------------------------
// 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/]
[[ccr-put-follow-prereqs]]
==== {api-prereq-title}
* 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 <<security-privileges>>.
[[ccr-put-follow-desc]]
==== {api-description-title}
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.
[[ccr-put-follow-path-parms]]
==== {api-path-parms-title}
`<follower_index>`::
(Required, string) The name of the follower index.
[[ccr-put-follow-query-params]]
==== {api-query-parms-title}
`wait_for_active_shards`::
(Optional, integer) Specifies the number of shards to wait on being active before
responding. This defaults to waiting on none of the shards to be active. A
shard must be restored from the leader index being active. Restoring a
follower shard requires transferring all the remote Lucene segment files to
the follower index.
[[ccr-put-follow-request-body]]
==== {api-request-body-title}
`leader_index`::
(Required, string) The name of the index in the leader cluster to follow.
`remote_cluster`::
(Required, string) The <<modules-remote-clusters,remote cluster>> containing
the leader index.
include::../follow-request-body.asciidoc[]
[[ccr-put-follow-examples]]
==== {api-examples-title}
This example creates a follower index named `follower_index`:
[source,console]
--------------------------------------------------
PUT /follower_index/_ccr/follow?wait_for_active_shards=1
{
"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"
}
--------------------------------------------------
// TEST[setup:remote_cluster_and_leader_index]
The API returns the following result:
[source,console-result]
--------------------------------------------------
{
"follow_index_created" : true,
"follow_index_shards_acked" : true,
"index_following_started" : true
}
--------------------------------------------------