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---------
Co-authored-by: Liam Thompson <32779855+leemthompo@users.noreply.github.com>
Co-authored-by: Liam Thompson <leemthompo@gmail.com>
Co-authored-by: Martijn Laarman <Mpdreamz@gmail.com>
Co-authored-by: István Zoltán Szabó <szabosteve@gmail.com>
46 lines
1.7 KiB
Markdown
46 lines
1.7 KiB
Markdown
---
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mapped_pages:
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- https://www.elastic.co/guide/en/elasticsearch/reference/current/ilm-downsample.html
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---
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# Downsample [ilm-downsample]
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Phases allowed: hot, warm, cold.
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Aggregates a time series (TSDS) index and stores 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 and stored in the downsample index.
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This action corresponds to the [downsample API](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-downsample).
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The name of the resulting downsample index is `downsample-<original-index-name>-<random-uuid>`. If {{ilm-init}} performs the `downsample` action on a backing index for a data stream, the downsample index becomes a backing index for the same stream and the source index is deleted.
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To use the `downsample` action in the `hot` phase, the `rollover` action **must** be present. If no rollover action is configured, {{ilm-init}} will reject the policy.
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## Options [ilm-downsample-options]
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`fixed_interval`
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: (Required, string) The [fixed time interval](docs-content://manage-data/lifecycle/rollup/understanding-groups.md#rollup-understanding-group-intervals) into which the data will be downsampled.
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## Example [ilm-downsample-ex]
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```console
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PUT _ilm/policy/datastream_policy
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{
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"policy": {
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"phases": {
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"hot": {
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"actions": {
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"rollover": {
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"max_docs": 1
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},
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"downsample": {
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"fixed_interval": "1h"
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}
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}
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}
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}
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}
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}
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```
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