[Solr Wiki] Update of "HowToReindex" by ShawnHeisey

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The "HowToReindex" page has been changed by ShawnHeisey:
https://wiki.apache.org/solr/HowToReindex?action=diff&rev1=12&rev2=13

Comment:
"how long does it take?"

  
  Note that if you're not already using Solr as a data source, then you'll have to re-index *twice* in order to utilize that method.  Once to your intermediate Solr server(s), then from there to your server(s) that you're using for search.
  
+ == How long does it take? ==
+ A reindex is going to take AT LEAST as long as the initial indexing took.  Unless you delete the index entirely before beginning, it could take even longer.
+