On 2/22/2018 9:50 AM, Hodder, Rick wrote:
I am migrating from SOLR 4.10.2 to SOLR 7.1.
All seems to be going well, except for one thing: the score that is coming back
for the resulting documents is giving different scores.
The absolute score has no meaning when you change something -- the
index, the query, the software version, etc. You can't compare absolute
scores.
What matters is the relative score of one document to another *in the
same query*. The amount of difference is almost irrelevant -- the goal
of Lucene's score calculation gymnastics is to have one document score
higher than another, so the *order* is reasonably correct.
Assuming you're using the default relevancy sort, does the order of your
search results change dramatically from one version to the other? If it
does, is the order generally better from a relevance standpoint, or
generally worse? If you are specifying an explicit sort, then the
scores will likely be ignored.
What I am describing is also why it's strongly recommended that you
never try to convert scores to percentages:
https://wiki.apache.org/lucene-java/ScoresAsPercentages
Thanks,
Shawn
