The request URL and request body parameters are as follows:

PUT auto_sync/pattern/{pattern_name}

**Table 1** Request body parameters
Parameter	Description
remote_cluster	Name of the primary cluster. The default name is leader1. You can change the name by configuring the primary cluster information.
remote_index_patterns	Mode of the index to be synchronized in the primary cluster. The wildcard (*) is supported.
local_index_pattern	Mode of the index being synchronized in the secondary cluster. The template can be replaced. For example, if this parameter is set to {{remote_index}}-sync, the index log1 change to log1-sync after synchronization.
apply_exist_index	Whether to synchronize existing indexes in the primary cluster. The default value is true.
settings	Index settings of the index being synchronized

The following are two examples:

1. Synchronize a single index from the primary cluster to the secondary cluster.

PUT auto_sync/pattern/pattern1
{
 "remote_cluster": "leader1",
 "remote_index_patterns": "log*",
 "local_index_pattern": "{{remote_index}}-sync",
 "apply_exist_index": true
}

2. Synchronize a single index from the primary cluster to the secondary cluster and modify the index configurations.

PUT auto_sync/pattern/pattern1
{
 "remote_cluster": "leader1",
 "remote_index_patterns": "log*",
 "local_index_pattern": "{{remote_index}}-sync",
 "apply_exist_index": true,
 "settings": {
   "number_of_replicas": 4
 }
}

The following index configurations cannot be modified:

number_of_shards
version.created
uuid
creation_date
soft_deletes.enabled

Matching Index Synchronization