Christine Poerschke created SOLR-8621:
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             Summary: 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 

*ticket todos*
* add <mergePolicyFactory> examples to this ticket
* work-in-progress git branch off master - to be created (Christine)
* Solr Reference Guide update (at/towards the very end i.e. master and 
branch_5x commits)






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