---
title: High replica count on cold nodes
description: Describes what AutoOps detects and surfaces with the High replica count on cold nodes insight: Some indices on cold nodes have a higher replica count than the configured threshold.
url: https://docs-v3-preview.elastic.dev/elastic/autoops-insights/tree/main/elasticsearch/high_replica_count_on_cold_nodes
products:
  - Elastic Cloud Enterprise
  - Elastic Cloud Hosted
  - Elastic Cloud on Kubernetes
  - Elasticsearch
applies_to:
  - Elastic Cloud Hosted: Generally available
  - Elastic Cloud on Kubernetes: Generally available
  - Elastic Cloud Enterprise: Generally available
  - Self-managed Elastic deployments: Generally available
---

# High replica count on cold nodes
Some indices on cold nodes have a higher replica count than the configured threshold. Extra replicas duplicate every primary shard and still consume storage and cluster resources on cold nodes that typically hold rarely queried data.
<note>
  For a complete list of insights, refer to [AutoOps insights](https://docs-v3-preview.elastic.dev/elastic/autoops-insights/tree/main/elasticsearch).
</note>


## Insight details


| Field     | Value                             |
|-----------|-----------------------------------|
| Component | Elasticsearch                     |
| Severity  | Low                               |
| Scope     | Node                              |
| Domains   | replication, resource-utilization |


## Example: What you might see in AutoOps

The following is an example of what you might see when this insight is triggered. Real insights use live data and links from your deployment or cluster.

### High replica count on some indices on cold nodes


#### What was detected

2 replicas on cold nodes for these indices: `logs-prod-000045`, `logs-prod-000046`.

#### Recommendations

<note>
  AutoOps shows different recommendations depending on how their conditions match your deployment or cluster.
</note>

<dropdown title="Reduce replicas to zero">
  **Condition**: Shown when replication factor exceeds cold tier threshold.Confirm logs-prod-000045 is backed up, then set `number_of_replicas` to 0 on the cold tier with the action below (currently 2 replicas). Fewer replicas can increase search latency because fewer nodes serve reads.
  ```json

  {
    "index": {
      "number_of_replicas": 0
    }
  }
  ```

  <note>
    Requires the `manage` index privilege. Requires Elasticsearch 8.0.0 or later. This action changes cluster or index configuration.
  </note>
</dropdown>


#### Background and impact

Each replica is a full copy of a primary shard. Higher replica counts improve availability and search capacity, but they also multiply disk use and write amplification: every index, update, and recovery must reach every replica.
On the cold tier, which usually holds rarely searched data, more replicas than you need for fault tolerance still occupy storage and recovery capacity. If the replica count stays high without a matching availability requirement, cold-tier cost rises while search benefit stays limited.

## Guide

[Warning: Not enough nodes to allocate all shard replicas](https://docs-v3-preview.elastic.dev/elastic/docs-content/tree/main/troubleshoot/elasticsearch/increase-tier-capacity)