[jira] [Updated] (SOLR-15440) contrib/ltr FieldValueFeature: DocValues use for stored fields

["Christine Poerschke (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-15440?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Christine Poerschke updated SOLR-15440:
---------------------------------------
        Parent: SOLR-12688
    Issue Type: Sub-task  (was: Improvement)

> contrib/ltr FieldValueFeature: DocValues use for stored fields
> --------------------------------------------------------------
>
>                 Key: SOLR-15440
>                 URL: https://issues.apache.org/jira/browse/SOLR-15440
>             Project: Solr
>          Issue Type: Sub-task
>          Components: contrib - LTR
>            Reporter: Christine Poerschke
>            Priority: Major
>
> SOLR-12697 in Solr 8.9 is intending to add {{FieldValueFeature}} support "stored=false docValues=true" a.k.a. pure DocValues fields.
> The SOLR-12697 changes are implemented in a backwards compatible manner i.e. existing behaviour for "stored=trued docValues=true" a.k.a. stored DocValues fields does not change.
> This ticket here is to explore how backwards compatibility could potentially be broken (in a safe manner) in future e.g.
>  * Solr 9.0 breaks backwards compatibility for {{FieldValueFeature}} but provides a deprecated {{LegacyFieldValueFeature}} with the existing behaviour for users who need that.
>  * Solr 9.X or 10.0 removes the deprecated {{LegacyFieldValueFeature}} class and users still needing the legacy behaviour need to create and maintain an equivalent local custom class.



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