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  • Data Import Handler has been removed from Solr
  • Legacy cloud mode is no longer supported
  • 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 has been removed from Solr. This encompasses all previous included /browse and wt=velocity examples.
  • Legacy SolrCache implementations (LRUCache, LFUCache, FastLRUCache) have been removed. Users have to modify their existing configurations to use CaffeineCache instead.
  • Cross Data Center Replication has been removed in this released.
  • SolrJ clients using old Apache HttpClient without HTTP2 support have been deprecated. Some classes renamed. New Builder have been provided for CloudSolrClientThese are: HttpSolrClient, LBHttpSolrClient and a few more
  • SolrJ class CloudSolrClient has been renamed as CloudLegacySolrClient. CloudSolrClient now has HTTP2 support and has a new Builder. See Upgrade Notes