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https://issues.apache.org/jira/browse/SOLR-8621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15153148#comment-15153148
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Hoss Man commented on SOLR-8621:
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bq. Shouldn't the index config reference page still list <mergePolicy> but with
a "Deprecated" notice?
No.
The ref guide is not a living document, there are specific versions for each
release that show the *current* way of doing things (not the old way). When
users lookup how to do something we don't want to confuse them by telling them
how to do something that is no longer supported. If you want to know how to
edit older configs, look at older versions of the ref guide.
> solrconfig.xml: deprecate/replace <mergePolicy> with <mergePolicyFactory>
> -------------------------------------------------------------------------
>
> Key: SOLR-8621
> URL: https://issues.apache.org/jira/browse/SOLR-8621
> Project: Solr
> Issue Type: Task
> Reporter: Christine Poerschke
> Assignee: Christine Poerschke
> Fix For: 5.5, master
>
> Attachments: SOLR-8621-example_contrib_configs.patch,
> SOLR-8621-example_contrib_configs.patch, SOLR-8621.patch,
> explicit-merge-auto-set.patch
>
>
> *<mergePolicyFactory> end-user benefits:*
> * Lucene's UpgradeIndexMergePolicy can be configured in Solr
> * Lucene's SortingMergePolicy can be configured in Solr (with SOLR-5730)
> * customisability: arbitrary merge policies including wrapping/nested merge
> policies can be created and configured
> *roadmap:*
> * solr 5.5 introduces <mergePolicyFactory> support
> * solr 5.5 deprecates (but maintains) <mergePolicy> support
> * SOLR-8668 in solr 6.0(\?) will remove <mergePolicy> support
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