elasticsearch-js/docs/reference/api/AggregationsDateHistogramBucketKeys.md

# `AggregationsDateHistogramBucketKeys` [interface-AggregationsDateHistogramBucketKeys]

| Name | Type | Description |
| - | - | - |
| `key_as_string` | string |   |
| `key` | [EpochTime](./EpochTime.md)<[UnitMillis](./UnitMillis.md)> | &nbsp; |