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?


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