# `AggregationsRangeBucketKeys` [interface-AggregationsRangeBucketKeys]

| Name | Type | Description |
| - | - | - |
| `from_as_string` | string |   |
| `from` | [double](./double.md) |   |
| `key` | string | The bucket key. Present if the aggregation is _not_ keyed |
| `to_as_string` | string |   |
| `to` | [double](./double.md) |   |