Replication settings

The replication plugin adds several settings to the standard OpenSearch cluster settings. The settings are dynamic, so you can change the default behavior of the plugin without restarting your cluster. You can mark settings as persistent or transient.

For example, to update how often the follower cluster polls the leader cluster for updates:

PUT _cluster/settings
{
  "persistent": {
    "plugins.replication.follower.metadata_sync_interval": "30s"
  }
}

These settings manage the resources consumed by remote recoveries. We don’t recommend changing these settings; the defaults should work well for most use cases.

Setting	Default	Description
`plugins.replication.follower.index.recovery.chunk_size`	10 MB	The chunk size requested by the follower cluster during file transfer. Specify the chunk size as a value and unit, for example, 10 MB, 5 KB. See Supported units.
`plugins.replication.follower.index.recovery.max_concurrent_file_chunks`	4	The number of file chunk requests that can be sent in parallel for each recovery.
`plugins.replication.follower.index.ops_batch_size`	50000	The number of operations that can be fetched at a time during the syncing phase of replication.
`plugins.replication.follower.concurrent_readers_per_shard`	2	The number of concurrent requests from the follower cluster per shard during the syncing phase of replication.
`plugins.replication.autofollow.fetch_poll_interval`	30s	How often auto-follow tasks poll the leader cluster for new matching indexes.
`plugins.replication.follower.metadata_sync_interval`	60s	How often the follower cluster polls the leader cluster for updated index metadata.
`plugins.replication.translog.retention_lease.pruning.enabled`	true	If enabled, prunes the translog based on retention leases on the leader index.
`plugins.replication.translog.retention_size`	512 MB	Controls the size of the translog on the leader index.