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Solr 8.6.0 Release Highlights:

• Health CheckCross-Collection Join Queries:
  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.
• Join queries can now work cross-collection, even when shared or when spanning nodes.
• Search:
  Performance improvement for some types of queries when using when exact hit count isn't needed by using BlockMax WAND algorithmAdmin UI:
  New panel with security info in admin UI's dashboard.
• 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.
• 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 using when exact hit count isn't needed by using BlockMax WAND algorithm.
• 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 dashboardPackage manager:
  Support for cluster (CoreContainer) level plugins.
• Query DSL:
  Support for {param:ref} and {bool: {excludeTags:""}}
  
• Ref Guide:Major redesign of Solr's documentation.

A summary of important changes is published in the Solr Reference Guide at https://lucene.apache.org/solr/guide/8_6/solr-upgrade-notes.html. For the most exhaustive list, see the full release notes at https://lucene.apache.org/solr/8_6_0/changes/Changes.html or by viewing the CHANGES.txt file accompanying the distribution.  Solr's release notes usually don't include Lucene layer changes.  Lucene's release notes are at https://lucene.apache.org/core/8_6_0/changes/Changes.html

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