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https://issues.apache.org/jira/browse/SOLR-8621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15140147#comment-15140147
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Shai Erera commented on SOLR-8621:
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bq. Could you take care of the solr/contrib and solr/example solrconfig.xml 
changes?

Sure, I'll take a look at them.

bq. And opening the follow-on issue to remove support for <mergePolicy> in 6.0?

Opened SOLR-8668.

About {{IndexSchema}}, I was going to propose that you add it as a ctor 
argument, but I see you've already done that. Just wondering though, what does 
{{SortingMergePolicyFactory}} need from IndexSchema that it cannot create on 
its own? It already receives the sort-by fields and order in the config, all it 
needs to do is to create a {{Sort}} class. What does it get from 
{{IndexSchema}} then?

> 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
>            Priority: Blocker
>             Fix For: 5.5, master
>
>         Attachments: SOLR-8621.patch, explicit-merge-auto-set.patch
>
>
> *<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
> *(proposed) roadmap:*
> * solr 5.5 introduces <mergePolicyFactory> support
> * solr 5.5(\?) deprecates (but maintains) <mergePolicy> support
> * solr 6.0(\?) removes <mergePolicy> support 
> +work-in-progress summary:+
>  * main code changes have been committed to master and branch_5x
>  * {color:red}further small code change required:{color} MergePolicyFactory 
> constructor or MergePolicyFactory.getMergePolicy method to take IndexSchema 
> argument (e.g. for use by SortingMergePolicyFactory being added under related 
> SOLR-5730)
>  * Solr Reference Guide changes (directly in Confluence?)
>  * changes to remaining solrconfig.xml
>  ** solr/core/src/test-files/solr/collection1/conf - Christine
>  ** solr/contrib
>  ** solr/example
> +open question:+
>  * Do we want to error if luceneMatchVersion >= 5.5 and deprecated 
> mergePolicy/mergeFactor/maxMergeDocs are used? See [~hossman]'s comment on 
> Feb 1st. The code as-is permits mergePolicy irrespective of 
> luceneMatchVersion, I think.



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