# `BulkOperationBase` [interface-BulkOperationBase]

| Name | Type | Description |
| - | - | - |
| `_id` | [Id](./Id.md) | The document ID. |
| `_index` | [IndexName](./IndexName.md) | The name of the index or index alias to perform the action on. |
| `if_primary_term` | [long](./long.md) |   |
| `if_seq_no` | [SequenceNumber](./SequenceNumber.md) |   |
| `routing` | [Routing](./Routing.md) | A custom value used to route operations to a specific shard. |
| `version_type` | [VersionType](./VersionType.md) |   |
| `version` | [VersionNumber](./VersionNumber.md) |   |