The Bulk Java API supports adding a payload to each request:
>
The Bulk Processor supports it as well. See:
>
So I suppose you can add your own needed payload with that method and retrieve it with `request.payloads()`
Doc says that payloads are coming back in the same order as the bulk item requests:
```auto
/**
* The list of optional payloads associated with requests in the same order as the requests. Note, elements within
* it might be null if no payload has been provided.
*
* Note, if no payloads have been provided, this method will return null (as to conserve memory overhead).
*/
@Nullable
public List