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https://issues.apache.org/jira/browse/LUCENE-5175?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13738894#comment-13738894
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Robert Muir commented on LUCENE-5175:
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Yes, unfortunately the crazy cache currently is what makes it as fast as
DefaultSimilarity, otherwise its 25% slower :(
>From time to time i definitely upgrade my JVM and run luceneutil to see if
>these caches can be removed!
As far as the norms, all the "provided" implementations were just setup to be
compatible with DefaultSimilarity.
so you can test these things out without reindexing, and still have general
support for index-time boosts and things like that.
If you don't care aout that, you can tweak the similarity to better meet your
specific needs (and even choose the other direction, too: to compress them to
use < 1 byte/doc: LUCENE-5077)
> Add parameter to lower-bound TF normalization for BM25 (for long documents)
> ---------------------------------------------------------------------------
>
> Key: LUCENE-5175
> URL: https://issues.apache.org/jira/browse/LUCENE-5175
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/search
> Reporter: Tom Burton-West
> Priority: Minor
> Attachments: LUCENE-5175.patch
>
>
> In the article "When Documents Are Very Long, BM25 Fails!" a fix for the
> problem is documented. There was a TODO note in BM25Similarity to add this
> fix. I will attach a patch that implements the fix shortly.
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