[ANNOUNCE] Apache Solr 8.6.0 released

[Bruno Roustant <br...@apache.org>]

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The Lucene PMC is pleased to announce the release of Apache Solr 8.6.0.


Solr is the popular, blazing fast, open source NoSQL search platform from
the Apache Lucene project. Its major features include powerful full-text
search, hit highlighting, faceted search, dynamic clustering, database
integration, rich document handling, and geospatial search. Solr is 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.


Solr 8.6.0 is available for immediate download at:


  <https://lucene.apache.org/solr/downloads.html>


### Solr 8.6.0 Release Highlights:


 * Cross-Collection Join Queries: Join queries can now work
cross-collection, even when shared or when spanning nodes.

 * Search: Performance improvement for some types of queries when exact hit
count isn't needed by using BlockMax WAND algorithm.

 * Streaming Expression: Percentiles and standard deviation aggregations
added to stats, facet and time series.  Streaming expressions added to
/export handler.  Drill Streaming Expression for efficient and accurate
high cardinality aggregation.

 * Package manager: Support for cluster (CoreContainer) level plugins.

 * Health Check: HealthCheckHandler can now require that all cores are
healthy before returning OK.

 * Zookeeper read API: A read API at /api/cluster/zk/* to fetch raw ZK data
and view contents of a ZK directory.

 * Admin UI: New panel with security info in admin UI's dashboard.

 * Query DSL: Support for {param:ref} and {bool: {excludeTags:""}}

 * Ref Guide: Major redesign of Solr's documentation.


Please read CHANGES.txt for a full list of new features and changes:


  <https://lucene.apache.org/solr/8_6_0/changes/Changes.html>


Solr 8.6.0 also includes features, optimizations  and bugfixes in the
corresponding Apache Lucene release:


  <https://lucene.apache.org/core/8_6_0/changes/Changes.html>


Note: The Apache Software Foundation uses an extensive mirroring network for

distributing releases. It is possible that the mirror you are using may not
have

replicated the release yet. If that is the case, please try another mirror.

This also applies to Maven access.

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