Thanks Hoss, that was really useful information.
hossman wrote:
: As I understood lucene's boost, if you search for John Le Carre it
will
: give better score to the results that contains just the searched string
that
: results that have, for example, 50 words and the search is contained in
the
: words.
:
: In Solr, my goal is to give more score to the docs that contains both
words
: but that have more words in the field.
:
: I have tried 2 options:
: 1.-On index time, I check the length of the fields and if are bigger
that
: 'x' chars i give more boost to that doc (I am adding 3.0 extra boost
using
: addBoost).
rather then explicitly setting an index time boost, i would use a custom
similarity class to do this -- the lengthNorm function is what you want to
change.
: 2.-In another hand I have been playing with tie and pf but I think they
are
: not helping in my issue.
neither of those options will offset the penalty assigned to longer docs
vs shorter docs if both match -- they will help you change the scores
for docs that match on multiple fields however.
: Before using Solr (my own Lucene searcher and indexer) the first option
use
: to work quite well, in Solr my extra boost seems to afect much less. Is
this
: normal as I am using DismaxQueryParser or it should be the same?
try using the standard request handler to build the same query structures
you are use to and make sure you're getting the expected results that way,
then consider how dismax might change things. one thing to watch out for
is that you really aren't doing things the same way ... it's really easy
to omitNorms=true in Solr, in which case your index time boost isn't
factoring in at all.
-Hoss
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