Keith Laban created SOLR-9648:

             Summary: Wrap all solr merge policies with SolrMergePolicy
                 Key: SOLR-9648
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
            Reporter: Keith Laban

Wrap the entry point for all merge policies with a single entry point merge 
policy for more fine grained control over merging with minimal configuration. 

The main benefit will be to allow upgrading of segments on startup when lucene 
version changes. Ideally we can use the same approach for adding and removing 
of doc values when the schema changes and hopefully other index type changes 
such as Trie -> Point types, or even analyzer changes. 

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