# `IngestDocument` [interface-IngestDocument]

| Name | Type | Description |
| - | - | - |
| `_id` | [Id](./Id.md) | Unique identifier for the document. This ID must be unique within the `_index`. |
| `_index` | [IndexName](./IndexName.md) | Name of the index containing the document. |
| `_source` | any | JSON body for the document. |