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https://issues.apache.org/jira/browse/SOLR-5670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13883288#comment-13883288
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Shawn Heisey commented on SOLR-5670:
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Reducing heap requirements by not requiring data to go into the FieldCache is a
major win for huge indexes. GC can be a major source of performance issues
even if you've got garbage collection superbly tuned, and I doubt that my
tuning parameters are perfect.
> _version_ either indexed OR docvalue
> ------------------------------------
>
> Key: SOLR-5670
> URL: https://issues.apache.org/jira/browse/SOLR-5670
> Project: Solr
> Issue Type: Improvement
> Components: SolrCloud
> Affects Versions: 4.7
> Reporter: Per Steffensen
> Assignee: Per Steffensen
> Labels: solr, solrcloud, version
> Attachments: SOLR-5670.patch, SOLR-5670.patch
>
>
> As far as I can see there is no good reason to require that "_version_" field
> has to be indexed if it is docvalued. So I guess it will be ok with a rule
> saying "_version_ has to be either indexed or docvalue (allowed to be both)".
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