[jira] [Updated] (LUCENE-6819) Deprecate index-time boosts?

["Adrien Grand (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-6819?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Adrien Grand updated LUCENE-6819:
---------------------------------
    Attachment: LUCENE-6819.patch

I think it is a fair requirement to make the upgrade easier. Here is a patch that removes index-time boosts. It makes Solr ignore index-time boosts, and log a debug message when a value that is different from 1.0 is supplied, in order to not break hard for users who would go to 7.0 without making sure to never set boosts. I can change it to a hard exception if you would like it better.

As far as 6.x is concerned, I think it would be enough to deprecate {{IndexableField.boost()}}, {{Field.setBoost(float)}} and methods in the Solr client API that take a boost parameter (most of them already have a variant that does not take a boost and implicitly sets it to 1.0, which we would keep)?

> 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
>         Attachments: LUCENE-6819.patch, LUCENE-6819-wip.patch
>
>
> 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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