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  • The Data Import Handler (DIH) is an independent project now; it is no longer a part of Solr
  • No more support for clusterstate.json and MIGRATESTATE API has been removed. If your collections use clusterstate.json, please refer to the Upgrade Notes
  • Auto scaling framework has been removed. Please refer to replica placement plugins for alternate options
  • LegacyBM25SimilarityFactory has been removed
  • VelocityResponseWriter is an independent project now; it is no longer a part of Solr. This encompasses all previously included /browse and wt=velocity examples
  • Legacy SolrCache implementations (LRUCache, LFUCache, FastLRUCache) have been removed. Users have to modify their existing configurations to not mention the class in order to get the default
  • Cross Data Center Replication has been removed
  • SolrJ clients like HttpSolrClient and LBHttpSolrClient that lacked HTTP2 support have been deprecated. The old CloudSolrClient has been renamed as CloudLegacySolrClient and deprecated
  • SimpleFSDirectoryFactory is removed in favor of NIOFSDirectoryFactory

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