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  • Certificate Authentication Plugin, enabling end-to-end use of x509 client certificates for Authentication and Authorization
  • Improved security when using PKI Authentication plugin
  • Upgrade to Zookeeper 3.7, allowing for TLS protected ZK communication
  • All request handlers support security permissions for access
  • Ability to disable admin UI through a system property
  • The property blockUnknown in the BasicAuthPlugin and the JWTAuthPlugin now defaults to true instead of false.
  • Solr now runs with the Java security manager enabled by default. Hadoop users may need to disable this
  • Solr embedded zookeeper only binds to localhost by default. See Upgrade Notes for how to obtain old behavior.
  • Dependency updates - A lot of dependency updates make Solr overall much more secure.

Stability and Scalability

  • Rate limiting provides a way to throttle update and search requests based on usage metrics.
  • Task management interface allows declaring tasks as cancellable and trackable.
  • Ability to specify node roles in Solr. This release supports 'Overseer' and 'Data' roles out of the box.
  • New API for pluggable replica assignment implementations that replaces replaces the auto-scaling framework.
  • An option to enable distributed processing of cluster state updates and Collection and Config API call processing without relying on the Overseer.

Build and Docker

  • Solr is now built and released independently from Lucene (separate Apache projects)
  • Build system switched to Gradle, no longer uses Ant + Ivy
  • Docker image creation is now a part of the Apache Solr Github repo
  • Docker image documentation is now a part of the reference guide
  • Official Docker image upgraded to use JDK17 (by Eclipse Temurin) and ability to create functionally identical local image

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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 in this release.
  • SolrJ clients like HttpSolrClient and LBHttpSolrClient that lacked HTTP2 support have been deprecated. The old CloudSolrClient has been renamed as CloudLegacySolrClient and deprecated.