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Following SOLR-8621, we should remove support for <mergePolicy> (and related <mergeFactor> and <maxMergeDocs>) in trunk/6x.
increase <mergePolicy> vs. <mergePolicyFactory> test coverage
solrconfig.xml: deprecate/replace <mergePolicy> with <mergePolicyFactory>
(from 7.0.0 onwards) remove three no-longer-supported warnings in SolrIndexConfig