it's not well documented yet, alas. It will be in the next release (I hope...).

see this thread though:
http://swish-e.org/archive/2004-12/8671.html

it has some instructions on using -r and -u.

John Paige scribbled on 5/12/05 11:16 AM:

> Thanks Peter.
> I still cannot find refernence to "-r" option anywhere in the documentation.
> 
> Could you please point me to the documentation?
> 
> Thanks,
> Ritu
> 
> On 5/12/05, Peter Karman <peter@peknet.com> wrote:
> 
>>first, you must be using --enable-incremental to do that. that's set at compile
>>time.
>>
>>second, you want the -r and -u options to remove and update, respectively.
>>
>>John Paige scribbled on 5/12/05 11:04 AM:
>>
>>
>>>Hi,
>>>  I have a very basic question, somhow I cannot find it in the
>>>documentation (I must have missed it!)
>>>How do delete a document from an index?
>>>For example, I have created an index xyz, added 10 documents to it. I
>>>want to update the same index xyz where I would like to add 2 more
>>>documents and delete the one that I indexed in the previous pass. How
>>>can I tell Swish to delete all the references to any document in an
>>>index?
>>>
>>>Thanks,
>>>John
>>
>>--
>>Peter Karman  .  http://peknet.com/  .  peter(at)not-real.peknet.com
>>

-- 
Peter Karman  .  http://peknet.com/  .  peter(at)not-real.peknet.com