remove field param from computeNorm, scorePayload ; remove UOE'd lengthNorm,
switch SweetSpot to per-field
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Key: LUCENE-2912
URL: https://issues.apache.org/jira/browse/LUCENE-2912
Project: Lucene - Java
Issue Type: Improvement
Reporter: Robert Muir
Fix For: 4.0
In LUCENE-2236 we switched sim to per field (SimilarityProvider returns a
per-field similarity).
But we didn't completely cleanup there... I think we should now do this:
* SweetSpotSimilarity loses all its hashmaps. Instead, just configure one per
field and return it in your SimilarityProvider. this means for example, all its
TF factors can now be configured per-field too, not just the length
normalization factors.
* computeNorm and scorePayload lose their field parameter, as its redundant and
confusing.
* the UOE'd obselete lengthNorm is removed. I also updated javadocs that were
pointing to it (this is bad!).
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