17 March 2022, Apache Solr™ 9.3.0 available

The Solr PMC is pleased to announce the release of Apache Solr 9.3.0

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Solr 9.3.0 Release Highlights

Solr releases now have a slim variant, both for the binary release and the docker image.
- The Slim variant is the same as the normal variant, except that it does not include Solr modules or the Prometheus exporter.
Vector Search
- Added support for byte vector encoding in DenseVectorField and KnnQParser
- High dimensional vectors are now supported in Solr
- Solr can now take advantage of SIMD optimizations for Vector calculations, when run with Java 20 or 21.
Solr now provides an "Install Shard" API to allow users who have built (per-shard) indices offline to import them into SolrCloud shards.
Solr’s experimental "v2" API has seen a number of improvements in the 9.3 release.
- It is now approaching parity with the functionality offered by Solr’s v1 API.
- The v2 API as a whole is being redesigned to be more REST-ful and intuitive.
  See the Changelog and upgrade notes for information on which v2 APIs have backward-incompatible changes.
New APIs for MigrateReplicas and BalanceReplicas. These work out-of-the-box with the built-in PlacementPlugins.
- The AffinityPlacementPlugin now supports co-location of shards between collections, using the "withCollectionShards" parameter.
Unknown cores are no longer deleted by default when Solr starts. Use "solr.deleteUnknownCores=true" to use the previous behavior.

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