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https://issues.apache.org/jira/browse/SOLR-8621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15123657#comment-15123657
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Christine Poerschke commented on SOLR-8621:
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bq. Is this simply a rename of the XML element name (from <mergePolicy> to
<mergePolicyFactory>) or is there some other user-visible feature enhancement
or change?
Good question. This is more-or-less-but-not-quite a simple rename (see
illustration below). The end-user benefit of the change is to make policies
such as Lucene's UpgradeIndexMergePolicy configurable in Solr (see illustration
above). The <mergePolicyFactory> element will also encompass all merge policy
related parameters whereas currently <mergeFactor> and <maxMergeDocs> elements
(applicable for some but not all merge policies) can be 'alongside' the
<mergePolicy> element.
*existing/deprecated:*
{code}
<mergeFactor>12</mergeFactor>
<maxMergeDocs>345</maxMergeDocs>
<mergePolicy class="..." />
<str name="abc">def</str>
</mergePolicy>
{code}
*replacement:*
{code}
<mergePolicyFactory class="...Factory">
<int name="mergeFactor">12</int>
<int name="maxMergeDocs">345</int>
<str name="abc">def</str>
</mergePolicyFactory>
{code}
> 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
>
> *<mergePolicyFactory> end-user benefits:*
> * Lucene's UpgradeIndexMergePolicy can be configured in Solr
> * (with SOLR-5730) Lucene's SortingMergePolicy can be configured in Solr
> * 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 6.0(\?) removes <mergePolicy> support
> +work-in-progress git branch:+
> [master-solr-8621|https://github.com/apache/lucene-solr/tree/master-solr-8621]
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