Hi Alex,
Tstamp represents fetch tiem, used for deduplication.
Boost is for scoring-opic and link. This is required in 2.x as well.
I don't have the code right now, but you can try removing digest and
segment. To me they both look legacy.
There is a wiki page on index structure which you can consult and/or add to
should you wish.
Thank you
Lewis

On Thursday, February 14, 2013,  <[email protected]> wrote:
> Hello,
>
> I see that there are
>
>                 <field dest="segment" source="segment"/>
>                 <field dest="boost" source="boost"/>
>                 <field dest="digest" source="digest"/>
>                 <field dest="tstamp" source="tstamp"/>
>
> fields in addition to title, host and content ones in nutch-2.x'
solr-mapping.xml. I thought tstamp may be needed for sorting documents.
What about the other fields,
> segment, boost and digest? Can someone explain, why these fields are
included in solr-mapping.xml?
>
>
> Thanks.
> Alex.
>
>
>

-- 
*Lewis*

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