[Solr Wiki] Update of "ReleaseNote721" by jimczi

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The "ReleaseNote721" page has been changed by jimczi:
https://wiki.apache.org/solr/ReleaseNote721?action=diff&rev1=5&rev2=6

Comment:
Update release note for 7.2.1

- ## page was copied from ReleaseNote701
  {{{
- 6 October 2017, Apache Solr™ 7.0.1 available
+ XX January 2018, Apache Solr™ 7.2.1 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,
@@ -12, +11 @@

  distributed search and indexing, and powers the search and navigation
  features of many of the world's largest internet sites.
  
- This release includes 2 bug fixes since the 7.0.0 release:
+ This release includes 3 bug fixes since the 7.2.0 release:
  
- * Solr 7.0 cannot read indexes from 6.x versions.
+ * Overseer can never process some last messages.
  
+ * Rename core in solr standalone mode is not persisted.
- * Message "Lock held by this virtual machine" during startup.  
-   Solr is trying to start some cores twice.
  
+ * QueryComponent's rq parameter parsing no longer considers the defType parameter.
+ 
+ * Fix NPE in SolrQueryParser when the query terms inside a filter clause reduce to nothing.
+ 
- Furthermore, this release includes Apache Lucene 7.0.1 which includes 1 bug
+ Furthermore, this release includes Apache Lucene 7.2.1 which includes 1 bug
- fix since the 7.0.0 release.
+ fix since the 7.2.0 release.
  
  The release is available for immediate download at:
  
-   http://www.apache.org/dyn/closer.lua/lucene/solr/7.0.1
+   http://www.apache.org/dyn/closer.lua/lucene/solr/7.2.1
  
  Please read CHANGES.txt for a detailed list of changes:
  
-   https://lucene.apache.org/solr/7_0_1/changes/Changes.html
+   https://lucene.apache.org/solr/7_2_1/changes/Changes.html
  
  Please report any feedback to the mailing lists
  (http://lucene.apache.org/solr/discussion.html)