WL#2549: improve query expansion
Affects: Server-7.1 — Status: Un-Assigned — Priority: Medium
1. take into account the relevance of found documents, assigning different weight to additional words. take few least-matching documents, using their words with a negative weight 2. from "improving automatic query expansion" - take into accound word correlations (that is f(idf(w1),idf(w2),idf(w1,w2))), rerank with taking window into accound and fuzzy boolean query.
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