[Solr Wiki] Update of "CoreAdmin" by ErickErickson

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The "CoreAdmin" page has been changed by ErickErickson:
http://wiki.apache.org/solr/CoreAdmin?action=diff&rev1=40&rev2=41

  
    http://localhost:8983/solr/admin/cores?action=UNLOAD&core=core0&deleteIndex=true
  
+ <!> [[Solr4.0]] Two more optional parameters are "deleteDataDir" and "deleteInstanceDir" on core unload. 
+  * deleteDataDir removes "data" and all sub-directories
+  * deleteInstanceDir removes ''everything'' related to the core, the index directory, the configuration files, etc. This command would remove the directory core0 and all sub-directories. NOTE: there is a bug in 4.0 [[https://issues.apache.org/jira/browse/SOLR-3984|SOLR-3984]] currently (4.0.0) that prevents this from working unless you specify the absolute path in your <core.../>. 
+ {{{
+ http://localhost:8983/solr/admin/cores?action=UNLOAD&core=core0&deleteIndex=true
+ }}}
+   
+ These three "delete*" commands form a hierarchy. "deleteInstanceDir" will do what both "deleteDataDir" and "deleteIndex" do. "deleteDataDir" will also "deleteIndexDir". You should only need to specify one.
+ 
  == LOAD ==
  
  /!\ '''not implemented yet! Use CREATE'''