---
title: number_of_replicas
description: The value of this setting determines the number of replica shards per primary shard in the target index.  The default value is 1. 
url: https://www.elastic.co/elastic/docs-builder/docs/3028/reference/elasticsearch/curator/option_number_of_replicas
products:
  - Elasticsearch
  - Elasticsearch Curator
---

# number_of_replicas
<note>
  This setting is only used by the [shrink](https://www.elastic.co/elastic/docs-builder/docs/3028/reference/elasticsearch/curator/shrink) action.
</note>

```yaml
action: shrink
description: >-
  Shrink selected indices on the node with the most available space.
  Set the number of replicas to 0.
options:
  shrink_node: DETERMINISTIC
  number_of_replicas: 0
filters:
  - filtertype: ...
```

The value of this setting determines the number of replica shards per primary shard in the target index.  The default value is `1`.