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---
mapped_pages:
- https://www.elastic.co/guide/en/elasticsearch/client/curator/current/filters.html
---
# Filters [filters]
Filters are the way to select only the indices (or snapshots) you want.
::::{admonition} Filter chaining
:class: note
It is important to note that while filters can be chained, each is linked by an implied logical **AND** operation. If you want to match from one of several different patterns, as with a logical **OR** operation, you can do so with the [pattern](/reference/filtertype_pattern.md) filtertype using *regex* as the [kind](/reference/fe_kind.md).
This example shows how to select multiple indices based on them beginning with either `alpha-`, `bravo-`, or `charlie-`:
```yaml
filters:
- filtertype: pattern
kind: regex
value: '^(alpha-|bravo-|charlie-).*$'
```
Explaining all of the different ways in which regular expressions can be used is outside the scope of this document, but hopefully this gives you some idea of how a regular expression pattern can be used when a logical **OR** is desired.
::::
The index filtertypes are:
* [age](/reference/filtertype_age.md)
* [alias](/reference/filtertype_alias.md)
* [allocated](/reference/filtertype_allocated.md)
* [closed](/reference/filtertype_closed.md)
* [count](/reference/filtertype_count.md)
* [empty](/reference/filtertype_empty.md)
* [forcemerged](/reference/filtertype_forcemerged.md)
* [kibana](/reference/filtertype_kibana.md)
* [none](/reference/filtertype_none.md)
* [opened](/reference/filtertype_opened.md)
* [pattern](/reference/filtertype_pattern.md)
* [period](/reference/filtertype_period.md)
* [space](/reference/filtertype_space.md)
The snapshot filtertypes are:
* [age](/reference/filtertype_age.md)
* [count](/reference/filtertype_count.md)
* [none](/reference/filtertype_none.md)
* [pattern](/reference/filtertype_pattern.md)
* [period](/reference/filtertype_period.md)
* [state](/reference/filtertype_state.md)
You can use [environment variables](/reference/envvars.md) in your configuration files.
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