please pardon me but I still confused: why can't you do this with the standard lucene?
It kind of seems like what solr does with function queries[0]. Is the difference in what the variables are?
The main difference is that you can update the document variables without fragmenting the index. In Lucene you need to reindex the document (i.e. delete it and write a new one). If you update your relevance variables an average of 10 times per document it can get really fragmented with Lucene.
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please pardon me but I still confused: why can't you do this with the standard lucene? It kind of seems like what solr does with function queries[0]. Is the difference in what the variables are?
http://wiki.apache.org/solr/FunctionQuery
The main difference is that you can update the document variables without fragmenting the index. In Lucene you need to reindex the document (i.e. delete it and write a new one). If you update your relevance variables an average of 10 times per document it can get really fragmented with Lucene.
ah, got it. The point is the document fields are updated in place instead of delete+reinsert. Seems interesting.