# `WriteResponseBase` [interface-WriteResponseBase]

| Name | Type | Description |
| - | - | - |
| `_id` | [Id](./Id.md) | The unique identifier for the added document. |
| `_index` | [IndexName](./IndexName.md) | The name of the index the document was added to. |
| `_primary_term` | [long](./long.md) | The primary term assigned to the document for the indexing operation. |
| `_seq_no` | [SequenceNumber](./SequenceNumber.md) | The sequence number assigned to the document for the indexing operation. Sequence numbers are used to ensure an older version of a document doesn't overwrite a newer version. |
| `_shards` | [ShardStatistics](./ShardStatistics.md) | Information about the replication process of the operation. |
| `_version` | [VersionNumber](./VersionNumber.md) | The document version, which is incremented each time the document is updated. |
| `forced_refresh` | boolean |   |
| `result` | [Result](./Result.md) | The result of the indexing operation: `created` or `updated`. |