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https://issues.apache.org/jira/browse/LUCENE-4627?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shai Erera resolved LUCENE-4627.
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Resolution: Won't Fix
> Migration layer for facets
> --------------------------
>
> Key: LUCENE-4627
> URL: https://issues.apache.org/jira/browse/LUCENE-4627
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Reporter: Shai Erera
>
> Spin-off from LUCENE-4602 (and LUCNE-4623). It will be good if we can develop
> some migration layer so that users don't need to re-index their content when
> we change how facets are written in the index. Currently the two open issues
> are cut over to DV and index drill-down terms w/ DOCS_ONLY, but in the future
> there could be other changes.
> I don't think that this layer needs to be very heavy. Something in the form
> of a FacetsAtomicReaderWrapper. For instance, to support the DV migration, we
> can implement a PayloadFacetsAtomicReader which translates the payload to DV
> API (i.e. its docValues() API will actually read from the payload).
> We'd need some API on IW I think to initialize that reader, so that data can
> be migrated from payload to DV during segment merges.
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