In this PR we introduce the API that will expose the global retention configuration and will allow users to take advantage of it.
These APIs are protected by the dedicated introduced privileges:
`manage_data_stream_global_retention` or higher, which allows all operations on the global retention configuration
`monitor_data_stream_retention` or higher, which allows the retrieval of the global retention configuration.
This PR is the final PR that makes the global retention available for our users.
This releases the Data stream lifecycle feature as a
Technical Preview feature.
Data stream lifecycle, albeit in technical preview, will allow data streams
to take advantage of a native simplified and resilient lifecycle implementation.
Currently the `GET target/_lifecycle/explain` API only works for
indices. In this PR we extend this behaviour to allow the target to be a
data stream so we can get the overview lifecycle status for all the
backing indices of a data stream.
This makes the data stream lifecycle generally available. This will allow
data streams to take advantage of a native simplified and resilient
lifecycle implementation.
In this PR we enable all new data streams to be managed by the data
stream lifecycle by default. This is implemented by adding an empty
`lifecycle: {}` upon new data stream creation.
Opting out is represented by a the `enabled` flag:
```
{
"lifecycle": {
"enabled": false
}
}
```
This change has the following implications on when is an index managed
and by which feature:
| Parent data stream lifecycle| ILM| `prefer_ilm`|Managed by|
|----------------------------|----|----------------|-| | default | yes|
true| ILM| | default | yes| false| data stream lifecycle| |default |
no|true/false|data stream lifecycle| |opt-out or
missing|yes|true/false|ILM| |opt-out or missing|no|true/false|unmanaged|
Data streams that have been created before the data stream lifecycle is
enabled will not have the default lifecycle.
Next steps: - We need to document this when the feature will be GA
(https://github.com/elastic/elasticsearch/issues/97973).
