Christine Poerschke created SOLR-15440:
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Summary: contrib/ltr FieldValueFeature: DocValues use for stored
fields
Key: SOLR-15440
URL: https://issues.apache.org/jira/browse/SOLR-15440
Project: Solr
Issue Type: Improvement
Components: contrib - LTR
Reporter: Christine Poerschke
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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