Page History

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• Minimum Java version supported: Java 11

• Powered by Lucene 9.0

New Features

• Dense Vector Search ← Explain

Security

• Certificate Authentication Plugin: Supports loading the certificate subject via a user principal into the AuthorizationContext and enables end-to-end use of client certificates for Authentication and Authorization
• Improved security when using PKI Authentication plugin
• Upgrade to ZK 3.7 allows for TLS communication between Solr and Zookeeper
• Jetty Request log is now enabled by default
• 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. This change is backward incompatible. If you need the pre-9.0 default behavior, you need to explicitly set blockUnknown:false in security.json.
• The allow-list defining allowed URLs for the shards parameter is not in the shardHandler configuration anymore. It is defined by the allowUrls top-level property of the solr.xml file. For more information, see Format of solr.allowUrls documentation
• Solr now runs with the java security manager enabled by default. Administrators that need to run Solr with Hadoop will need to disable this feature by setting SOLR_SECURITY_MANAGER_ENABLED=false in the environment or in one of the Solr init scripts. 
• Solr embedded zookeeper only binds to localhost by default. This embedded zookeeper should not be used in production. If you rely upon the previous behavior, then you can change the clientPortAddress in solr/server/solr/zoo.cfg
• Dependency updates - A lot of dependency updates make Solr overall much more secure.

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• 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 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 & Docker

• Solr is now built and released independently from Lucene (separate Apache projects)
• Build system switched to Gradle, no longer uses Ant + Ivy
• Docker

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• Image image creation is now a part of the Apache Solr Github repo
• Solr 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

Others

• Admin UI support for SQL Querying
• HDFS code is now an independent module
• Metrics handler only depends on SolrJ instead of core and has its own log4j2.xml now so it doesn’t share Solr’s logging config

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