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https://issues.apache.org/jira/browse/LUCENE-4623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13529983#comment-13529983
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Shai Erera commented on LUCENE-4623:
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Yes, that's a bug that's bugging me for some time. I thought that we could just
turn off the other indexing options for the drill-down terms, but then the
entire field gets screwed up.
If we're going to fix that, we'll need to provide index migration utilities,
either on the fly or as a one op (preferably on the fly). The drill-down terms
are used only for drill-down .. well in the case of associations it may not be
so, but nm them for now.
If we cutover to DV, we need index migration too. So maybe we stop everything
and develop some migration abilities? :)
> facets should index drill-down fields using DOCS_ONLY
> -----------------------------------------------------
>
> Key: LUCENE-4623
> URL: https://issues.apache.org/jira/browse/LUCENE-4623
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Reporter: Michael McCandless
>
> Today we index as DOCS_AND_POSITIONS, which is necessary because we stuff the
> payload into one of those tokens.
> If we indexed under two fields instead, then we could make the drill-down
> field DOCS_ONLY.
> But ... once/if we cutover to doc values then we could use one field again.
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