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https://issues.apache.org/jira/browse/LUCENE-6819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15876549#comment-15876549
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David Smiley commented on LUCENE-6819:
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I get your point. It's a shame that the particular use of the bits right now
was decided to have both 3 terms and 4 terms produce the same norm when, IMO,
there should be more fidelity for for them for the same reason you mentioned.
Maybe this specifically could be rectified instead of removal of index time
boosts?
Perhaps index time boosts support should be moved to the codec {{NormsFormat}}
which could have a method to declare wether it supports index time boosts or
not? ? i.e. we don't support it by default and if you want index time boosts
then you must do something to enable it?
On the other hand, I appreciate that removing this feature would be the
simplest route to take and reduce overall complexity in Lucene. And it's not
like index time boosts is a must-have; users can emulate it, albeit with some
work. Maybe that could be made easier... hmmm.
Any way; I'm not standing in your way. I'm curious what others think.
> Deprecate index-time boosts?
> ----------------------------
>
> Key: LUCENE-6819
> URL: https://issues.apache.org/jira/browse/LUCENE-6819
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Adrien Grand
> Priority: Minor
>
> Follow-up of this comment:
> https://issues.apache.org/jira/browse/LUCENE-6818?focusedCommentId=14934801&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14934801
> Index-time boosts are a very expert feature whose behaviour is tight to the
> Similarity impl. Additionally users have often be confused by the poor
> precision due to the fact that we encode values on a single byte. But now we
> have doc values that allow you to encode any values the way you want with as
> much precision as you need so maybe we should deprecate index-time boosts and
> recommend to encode index-time scoring factors into doc values fields instead.
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