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