This adds support for an index's index.lifecycle.origination_date setting in DLM. If an index has a
value for index.lifecycle.origination_date then it is used instead of the creation date or rollover
date (except in the case of the write index when the write index has not been rolled over yet).
This changes the `GET _data_stream/ds_name/_lifecycle` endpoint to
return the data stream name even if it doesn't have a lifecycle
configured.
e.g.
```
{
"data_streams": [
{
"name": "logs-nginx"
}
]
}
```
* Fix xcontent and tests
* Update docs
---------
Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>
This removes a redundant `lifecycle` field in the `PUT _lifecycle`
request.
Before we had
```
PUT _data_stream/logs-nginx/_lifecycle
{
"lifecycle": {
"data_retention": "7d"
}
}
```
This changes the request to
```
PUT _data_stream/logs-nginx/_lifecycle
{
"data_retention": "7d"
}
```
With PR we introduce CRUD endpoints which update/delete the data lifecycle on the data stream level. When this is updated it will apply at the next DLM run to all the backing indices that are managed by DLM.
Keith Massey
Andrei Dan
Mary Gouseti