There are index time boosts ie calculated at index time and search
time boosts. The field f always relates to the field(s) that the term
t appears in.
My understanding is that--
Norm(t,d) includes the index time boosts for each field but I think t
is only included in this calc in terms of field.ge
in javadoc
http://lucene.apache.org/java/2_4_0/api/org/apache/lucene/search/Similarity.html#formula_norm
norm(t,d) = doc.getBoost() ・ lengthNorm(field) ・ ∏ f.getBoost()
field
f in d named as t
whre is field come from in leng
