[Solr Wiki] Trivial Update of "FederatedSearch" by YonikSeeley

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The following page has been changed by YonikSeeley:
http://wiki.apache.org/solr/FederatedSearch

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  Areas that will need change:
   * Solr's caches don't contain enough info to merge search results from subsearchers
+    * could subclass DocList and add sort info, and cache that
+    * could dynamically add the sort info if requested via the FieldCache... this would make Solr's result cache smaller.
+    * probably want to re-use FieldDocSortedHitQueue, which means returning TopFieldDocs, or creating them on the fly from
+      a DocList w/ field info
  
  Network Transports
   * RMI
   * XML
+ 
+ Should this be more of a public API, or a private one?
+ For RMI, it should definitely be private...
  
  Misc:
   * optional global idf calculations