Lee Hinman fe2ef66e45 Expose index age in ILM explain output (#44457)
* Expose index age in ILM explain output

This adds the index's age to the ILM explain output, for example:

```
{
  "indices" : {
    "ilm-000001" : {
      "index" : "ilm-000001",
      "managed" : true,
      "policy" : "full-lifecycle",
      "lifecycle_date" : "2019-07-16T19:48:22.294Z",
      "lifecycle_date_millis" : 1563306502294,
      "age" : "1.34m",
      "phase" : "hot",
      "phase_time" : "2019-07-16T19:48:22.487Z",
      ... etc ...
    }
  }
}
```

This age can be used to tell when ILM will transition the index to the
next phase, based on that phase's `min_age`.

Resolves #38988

* Expose age in getters and in HLRC
2019-07-18 15:33:45 -06:00
..

Elastic License Functionality

This directory tree contains files subject to the Elastic License. The files subject to the Elastic License are grouped in this directory to clearly separate them from files licensed under the Apache License 2.0.