[Lucene-java Wiki] Update of "ReleaseNote50" by RobertMuir

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The "ReleaseNote50" page has been changed by RobertMuir:
https://wiki.apache.org/lucene-java/ReleaseNote50?action=diff&rev1=1&rev2=2

Comment:
add a few more to the list

   * ConcurrentMergeScheduler detects whether the index is on SSD or not and does a better job defaulting its settings. This only works on Linux for now; other OS's will continue to use the previous defaults (tuned for spinning disks).
   * Auto-IO-throttling has been added to ConcurrentMergeScheduler, to rate limit IO writes for each merge depending on incoming merge rate.
   * CustomAnalyzer has been added that allows to configure analyzers like you do in Solr's index schema. This class has a builder API to configure Tokenizers, TokenFilters, and CharFilters based on their SPI names and parameters as documented by the corresponding factories.
- * Memory index now supports payloads.
+  * Memory index now supports payloads.
+  * Added a filter cache with a usage tracking policy that caches filters based on frequency of use.
+  * The default codec has an option to control BEST_SPEED or BEST_COMPRESSION for stored fields.
+  * Stored fields are merged more efficiently, especially when upgrading from previous versions or using SortingMergePolicy
  
  To read more about the changes, also see: [[http://blog.mikemccandless.com/2014/11/apache-lucene-500-is-coming.html|Mike McCandless's blog about Lucene 5.0.0]]