[Solr Wiki] Update of "LotsOfCores" by ShalinMangar

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The "LotsOfCores" page has been changed by ShalinMangar.
The comment on this change is: Added SOLR-1530.
http://wiki.apache.org/solr/LotsOfCores?action=diff&rev1=7&rev2=8

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    * [[https://issues.apache.org/jira/browse/SOLR-1306|SOLR-1306]] - Support pluggable persistence/loading of solr.xml details
    * [[https://issues.apache.org/jira/browse/SOLR-1106|SOLR-1106]] - Pluggable CoreAdminHandler (Action ) architecture that allows for custom handler access to CoreContainer / request-response
    * [[https://issues.apache.org/jira/browse/SOLR-1416|SOLR-1416]] - Reduce contention in CoreContainer#getCore()
+   * [[https://issues.apache.org/jira/browse/SOLR-1530|SOLR-1530]] - Open IndexSearcher lazily
  
  Other features which may be needed for such a system include:
-  * Make it possible to open a searcher lazily - If indexing is being done continuously but searches are done infrequently we should avoid the overhead of opening searchers on every commit
   * Provide a way to partition data directories into multiple "bucket" directories. For example, instead of creating 10,000 data directories inside one base data directory, Solr can assign a core to one of 4 base directories, thereby distributing them.
   * Provide a way to completely remove a core - Currently the unload command keeps the core's data on disk even though the details of the core is deleted from configuration. Solr can have an option of cleaning the data directory on unload of a core
   * Changes to SolrJ for new start/stop commands and better error codes/messages.