# `ClusterStatsClusterIndicesShardsIndex` [interface-ClusterStatsClusterIndicesShardsIndex]

| Name | Type | Description |
| - | - | - |
| `primaries` | [ClusterStatsClusterShardMetrics](./ClusterStatsClusterShardMetrics.md) | Contains statistics about the number of primary shards assigned to selected nodes. |
| `replication` | [ClusterStatsClusterShardMetrics](./ClusterStatsClusterShardMetrics.md) | Contains statistics about the number of replication shards assigned to selected nodes. |
| `shards` | [ClusterStatsClusterShardMetrics](./ClusterStatsClusterShardMetrics.md) | Contains statistics about the number of shards assigned to selected nodes. |