I'm executing a query_string query with one term on multiple fields, _all
and tags.name, and trying to understand the scoring. Query:
Here are the documents returned by the query:
- Document 1 has an exact match on tags.name, but not on _all.
- Document 8 has an exact match on both tags.name and on _all.
Document 8 should win, and it does, but I'm confused by how the scoring
works out. It seems like Document 1 is getting penalized by having its
tags.name score multiplied by the IDF twice, whereas Document 8's tags.name score
is only multiplied by the IDF once. In short:
- They both have a component weight(tags.name:animal in 0)
- In Document 1, we have weight = score = queryWeight x fieldWeight.
- In Document 8, we have weight = fieldWeight!
Since queryWeight contains idf, this results in Document 1 getting
penalized by its idf twice.
Can anyone make sense of this?
I posted this on Stackoverflowhttp://stackoverflow.com/questions/21213947/why-is-queryweight-included-for-some-result-scores-but-not-othersa week ago; the question has some additional information attached to it.
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