# Downsample an index

**POST /{index}/_downsample/{target_index}**

Aggregate a time series (TSDS) index and store pre-computed statistical summaries (`min`, `max`, `sum`, `value_count` and `avg`) for each metric field grouped by a configured time interval.
For example, a TSDS index that contains metrics sampled every 10 seconds can be downsampled to an hourly index.
All documents within an hour interval are summarized and stored as a single document in the downsample index.

NOTE: Only indices in a time series data stream are supported.
Neither field nor document level security can be defined on the source index.
The source index must be read only (`index.blocks.write: true`).


## Servers
- http://api.example.com: http://api.example.com ()


## Authentication methods
- Api key auth
- Basic auth
- Bearer auth


## Parameters

### Path parameters
- **index** (string)
  Name of the time series index to downsample.
- **target_index** (string)
  Name of the index to create.


### Body: application/json (object)

- **fixed_interval** (string)
  The interval at which to aggregate the original time series index.


## Responses
### 200


#### Body: application/json (object)
object

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