Page History

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• 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.
• 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.

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