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From Anshum Gupta <>
Subject [ANNOUNCE] Apache Solr 5.2.0 and Reference Guide for Solr 5.2 released
Date Mon, 08 Jun 2015 01:04:15 GMT
07 June 2015, Apache Solr™ 5.2 available

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 (e.g., Word, PDF) 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 5.2 is available for immediate download at:

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

Solr 5.2 Release Highlights:

 * Restore API allows restoring a core from an index backup.

 * JSON Facet API
   * unique() is now implemented for numeric and date fields
   * Optional flatter form via a "type" parameter
   * Added support for "mincount" parameter in range facets to suppress
buckets less than that count
   * Multi-select faceting support for the Facet Module via the
"excludeTags" parameter which disregards any matching tagged filters for
that facet.
   * hll() facet function for distributed cardinality via HyperLogLog
    See examples at

 * A new "facet.range.method" parameter to let users choose how to do range
faceting between an implementation based on filters (previous algorithm,
using "facet.range.method=filter") or DocValues ("facet.range.method=dv")

 * Rule-based Replica assignment during collection, shard, and replica

 * Stats component:
   * New 'cardinality' option for stats.field, uses HyperLogLog to
efficiently estimate the cardinality of a field w/bounded RAM. Blog post:
   * stats.field now supports individual local params for 'countDistinct'
and 'distinctValues'. 'calcdistinct' is still supported as an alias for
both options.

* Solr security
   * Authentication and Authorization frameworks that define interfaces,
and mechanisms to create, load, and use authorization/authentication
plugins have been added.
   * A Kerberos authentication plugin which would allow running a
Kerberized Solr setup.

* Solr Streaming Expressions. See

 * bin/post (and SimplePostTool in -Dauto=yes mode) now sends rather than
skips files without a known content type, as "application/octet-stream",
provided it still is in the allowed filetypes setting.

 * HDFS transaction log replication factor is now configurable

 * A cluster-wide property can now be be added/edited/deleted using the
zkcli script and doesn't require a running Solr instance.

 * New spatial RptWithGeometrySpatialField, based on
CompositeSpatialStrategy, which blends RPT indexes for speed with
serialized geometry for accuracy.  Includes a Lucene segment based
in-memory shape cache.

 * Refactored Admin UI using AngularJS. It isn't the default, but a
parallel UI interface in this release.

 * Solr has internally been upgraded to use Jetty 9.

Solr 5.2 also includes many other new features as well as numerous
optimizations and bugfixes of the corresponding Apache Lucene release.

For upgrading from 5.1, please look at the "Upgrading from Solr 5.1"
section in the change log.

Detailed change log:

Also available is the Solr Reference Guide for Solr 5.2. This PDF serves as
the definitive user's manual for Solr 5.2. It can be downloaded from the
Apache mirror network:

Please report any feedback to the mailing lists

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 goes for Maven access.

Anshum Gupta

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