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The Solr PMC is pleased to announce the release of Apache Solr 9.0

Solr is the popular, blazing fast, open source search platform from the Apache Solr project. Its major features include powerful full-text search, hit highlighting, faceted search and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and highly scalable, providing fault tolerant distributed search and indexing, and powers the search and navigation features of many of the world's largest internet sites.

The release is available for immediate download at:

https://solr.apache.org/downloads.html

Please read CHANGES.txt for a detailed list of changes:

https://solr.apache.org/docs/9_0_0/changes/Changes.html


Solr 9.0.0 Release Highlights:

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 enabled by default
- All request handlers support security permissions for access
- Ability to disable admin UI through a system property

Stability

- Dependency updates - A lot of dependency updates make Solr overall much more stable and secure.
- Rate limiting privides a way to throttle update and search requests based on usage metrics.
- Task management interface allows declaring tasks as cancellable and trackable.

Scalability

- 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
- Distributed Overseer (optional) allows for distributed processing of clsuter state updates and Collection and Config API call processing without relying on the Overseer.

Others

- 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

Build

- Independent build and release
- Build system switched to gradle, no longer uses ant

Docker

- 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 image upgraded to use JDK17 (by Eclipse Temurin) and ability to create functionally identical local image

Deprecations and Removal

- 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.
- Cross Data Center Replication has been removed in this released.


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