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Solr 9.0.0 Release Highlights:

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 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

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