Create a follower Added in 6.5.0

PUT /{index}/_ccr/follow
Api key auth Basic auth Bearer auth

Create a cross-cluster replication follower index that follows a specific leader index. When the API returns, the follower index exists and cross-cluster replication starts replicating operations from the leader index to the follower index.

Path parameters

  • index string Required

    The name of the follower index.

Query parameters

  • master_timeout string

    Period to wait for a connection to the master node.

    Values are -1 or 0.

  • wait_for_active_shards number | string

    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 before being active. Restoring a follower shard requires transferring all the remote Lucene segment files to the follower index.

    Values are all or index-setting.

application/json

Body Required

  • data_stream_name string

    If the leader index is part of a data stream, the name to which the local data stream for the followed index should be renamed.

  • leader_index string Required
  • max_outstanding_read_requests number

    The maximum number of outstanding reads requests from the remote cluster.

  • max_outstanding_write_requests number

    The maximum number of outstanding write requests on the follower.

  • max_read_request_operation_count number

    The maximum number of operations to pull per read from the remote cluster.

  • max_read_request_size number | string

    One of:
    ByteSize number ByteSize string
  • max_retry_delay string

    A duration. Units can be nanos, micros, ms (milliseconds), s (seconds), m (minutes), h (hours) and d (days). Also accepts "0" without a unit and "-1" to indicate an unspecified value.

  • max_write_buffer_count number

    The maximum number of operations that can be queued for writing. When this limit is reached, reads from the remote cluster will be deferred until the number of queued operations goes below the limit.

  • max_write_buffer_size number | string

    One of:
    ByteSize number ByteSize string
  • max_write_request_operation_count number

    The maximum number of operations per bulk write request executed on the follower.

  • max_write_request_size number | string

    One of:
    ByteSize number ByteSize string
  • read_poll_timeout string

    A duration. Units can be nanos, micros, ms (milliseconds), s (seconds), m (minutes), h (hours) and d (days). Also accepts "0" without a unit and "-1" to indicate an unspecified value.

  • remote_cluster string Required

    The remote cluster containing the leader index.

  • settings object
    Index settings

Responses

  • 200 application/json
    Hide response attributes Show response attributes object
    • follow_index_created boolean Required
    • follow_index_shards_acked boolean Required
    • index_following_started boolean Required
PUT /{index}/_ccr/follow 
PUT /follower_index/_ccr/follow?wait_for_active_shards=1
{
  "remote_cluster" : "remote_cluster",
  "leader_index" : "leader_index",
  "settings": {
    "index.number_of_replicas": 0
  },
  "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 \
 --request PUT 'http://api.example.com/{index}/_ccr/follow' \
 --header "Authorization: $API_KEY" \
 --header "Content-Type: application/json" \
 --data '"{\n  \"remote_cluster\" : \"remote_cluster\",\n  \"leader_index\" : \"leader_index\",\n  \"settings\": {\n    \"index.number_of_replicas\": 0\n  },\n  \"max_read_request_operation_count\" : 1024,\n  \"max_outstanding_read_requests\" : 16,\n  \"max_read_request_size\" : \"1024k\",\n  \"max_write_request_operation_count\" : 32768,\n  \"max_write_request_size\" : \"16k\",\n  \"max_outstanding_write_requests\" : 8,\n  \"max_write_buffer_count\" : 512,\n  \"max_write_buffer_size\" : \"512k\",\n  \"max_retry_delay\" : \"10s\",\n  \"read_poll_timeout\" : \"30s\"\n}"'
Request example
Run `PUT /follower_index/_ccr/follow?wait_for_active_shards=1` to create a follower index named `follower_index`. 
{
  "remote_cluster" : "remote_cluster",
  "leader_index" : "leader_index",
  "settings": {
    "index.number_of_replicas": 0
  },
  "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 (200)
A successful response from `PUT /follower_index/_ccr/follow?wait_for_active_shards=1`. 
{
  "follow_index_created" : true,
  "follow_index_shards_acked" : true,
  "index_following_started" : true
}