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Elasticsearch Reference [7.0] » X-Pack APIs » Cross-cluster replication APIs » Create auto-follow pattern API
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Create auto-follow pattern API

Creates an auto-follow pattern.

Description

This API creates a new named collection of auto-follow patterns against the remote cluster specified in the request body. Newly created indices on the remote cluster matching any of the specified patterns will be automatically configured as follower indices.

Request

PUT /_ccr/auto_follow/<auto_follow_pattern_name>
{
  "remote_cluster" : "<remote_cluster>",
  "leader_index_patterns" :
  [
    "<leader_index_pattern>"
  ],
  "follow_index_pattern" : "<follow_index_pattern>"
}

Path Parameters

auto_follow_pattern_name (required)
(string) name of the collection of auto-follow patterns

Request Body

remote_cluster
(required string) the remote cluster containing the leader indices to match against
leader_index_patterns
(array) an array of simple index patterns to match against indices in the remote cluster specified by the remote_cluster field
follow_index_pattern
(string) the name of follower index; the template {{leader_index}} can be used to derive the name of the follower index from the name of the leader index
max_read_request_operation_count
(integer) the maximum number of operations to pull per read from the remote cluster
max_outstanding_read_requests
(long) the maximum number of outstanding reads requests from the remote cluster
max_read_request_size
(byte value) the maximum size in bytes of per read of a batch of operations pulled from the remote cluster
max_write_request_operation_count
(integer) the maximum number of operations per bulk write request executed on the follower
max_write_request_size
(byte value) the maximum total bytes of operations per bulk write request executed on the follower
max_outstanding_write_requests
(integer) the maximum number of outstanding write requests on the follower
max_write_buffer_count
(integer) 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
(byte value) the maximum total bytes of operations that can be queued for writing; when this limit is reached, reads from the remote cluster will be deferred until the total bytes of queued operations goes below the limit
max_retry_delay
(time value) the maximum time to wait before retrying an operation that failed exceptionally; an exponential backoff strategy is employed when retrying
read_poll_timeout
(time value) the maximum time to wait for new operations on the remote cluster when the follower index is synchronized with the leader index; when the timeout has elapsed, the poll for operations will return to the follower so that it can update some statistics, and then the follower will immediately attempt to read from the leader again

Default values

The following output from the follow info api describes all the default values for the above described index follow request parameters:

{
  "follower_indices" : [
    {
      "parameters" : {
        "max_read_request_operation_count" : 5120,
        "max_read_request_size" : "32mb",
        "max_outstanding_read_requests" : 12,
        "max_write_request_operation_count" : 5120,
        "max_write_request_size" : "9223372036854775807b",
        "max_outstanding_write_requests" : 9,
        "max_write_buffer_count" : 2147483647,
        "max_write_buffer_size" : "512mb",
        "max_retry_delay" : "500ms",
        "read_poll_timeout" : "1m"
      }
    }
  ]
}

Authorization

If the Elasticsearch security features are enabled, you must have read and monitor index privileges for the leader index patterns. You must also have manage_ccr cluster privileges on the cluster that contains the follower index. For more information, see Security privileges.

Example

This example creates an auto-follow pattern named my_auto_follow_pattern:

PUT /_ccr/auto_follow/my_auto_follow_pattern
{
  "remote_cluster" : "remote_cluster",
  "leader_index_patterns" :
  [
    "leader_index*"
  ],
  "follow_index_pattern" : "{{leader_index}}-follower",
  "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:

{
  "acknowledged" : true
}
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