[Solr Wiki] Update of "ReleaseNote63" by ShalinMangar

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Release notes for 6.3.0

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4 November 2016, Apache Solr 6.3.0 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 and analytics, rich document parsing, geospatial search, extensive REST APIs as well as parallel SQL. Solr is enterprise grade, secure and 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 6.3.0 is available for immediate download at:

 . http://lucene.apache.org/solr/mirrors-solr-latest-redir.html

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

 . https://lucene.apache.org/solr/6_3_0/changes/Changes.html

Solr 6.3 Release Highlights:

DocValues, streaming, /export, machine learning:
* Optimize, store and deploy AI models in Solr
* Ability to add custom streaming expressions 
* New streaming expressions such as "fetch", "executor", and "commit" added.
* Parallel SQL accepts <, >, =, etc., symbols.
* Support facet scoring with the scoreNodes expression
* Retrieving docValues as stored values was sped up by using the proper leaf reader rather than ask for a global view.  In extreme cases, this leads to a 100x speedup.

Faceting:
* facet.method=enum can bypass exact counts calculation with facet.exists=true, it just returns 1 for terms which exists in result docset
* Add "overrequest" parameter to JSON Facet API to control amount of overrequest  on a distributed terms facet

bin/solr script
* You can now set Solr's log level through environment variable SOLR_LOG_LEVEL. Also adds convenience arguments -q (quiet: WARN) and -v (verbose: DEBUG) to bin/solr
* Support SOLR_AUTHENTICATION_OPTS in windows bin/solr.cmd script
* GC logs are rolled over by default via bin/solr scripts
* Fix bin/solr calculations for start/stop wait time and RMI_PORT
* New parameter -u <user:pass> in bin/post to pass basicauth credentials
* bin/solr start script now exits with informative message if using wrong Java version
* zk upconfig command was broken on windows

SolrCloud
* The DELETEREPLICA API can accept a 'count' parameter and remove "count" number of replicas from each shard if the shard name is not provided
* The config API shows expanded useParams for request handlers inline
* Ability to create/delete/list snapshots at collection level
* The modify collection API now waits for the modified properties to show up in the cluster state before returning
* Many bug fixes related to SolrCloud recovery for data safety and faster recovery times.

Security
* SolrJ now supports Kerberos delegation tokens
* Pooled SSL connections were not being re-used. This is now fixed.
* Fix for the blockUnknown property which made inter-node communication impossible

Misc changes
* Solr's logging verbosity at the INFO level has been greatly reduced, and you may need to update the log configs to use the DEBUG level to see all the logging messages you used to see at INFO level before.
* We are no longer backing up solr.log and solr_gc.log files in date-stamped copies forever. If you relied on the solr_log_<date> or solr_gc_log_<date> being in the logs folder that will no longer be the case. 
* Optimizations to lower memory allocations when indexing JSON as well as for replication between solr cloud nodes.
* A new Excel workbook (.xlsx) response writer has been added. Use 'wt=xlsx' request parameter on a query request to enable.

Further details of changes are available in the change log available at: http://lucene.apache.org/solr/6_3_0/changes/Changes.html

Please report any feedback to the mailing lists (http://lucene.apache.org/solr/discussion.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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