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---
mapped_pages:
- https://www.elastic.co/guide/en/elasticsearch/client/curator/current/option_max_size.html
---
# max_size [option_max_size]
```yaml
action: rollover
description: >-
Rollover the index associated with alias 'aliasname', which should be in the
form of prefix-000001 (or similar), or prefix-yyyy.MM.DD-1.
options:
name: aliasname
conditions:
max_size: 5gb
```
::::{note}
At least one of [max_age](/reference/option_max_age.md), [max_docs](/reference/option_max_docs.md), max_size or any combinations of the three are required as `conditions:` for the [Rollover](/reference/rollover.md) action.
::::
The maximum approximate size an index is allowed to be before triggering a rollover. Sizes must use Elasticsearch approved [human-readable byte units](http://www.elastic.co/guide/en/elasticsearch/reference/8.15/common-options.md). It *must* be nested under `conditions:` There is no default value. If this condition is specified, it must have a value, or Curator will generate an error.
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