[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=11&rev2=12

Comment:
added note about reindexing twice to switch to using Solr as a source.

  
  This is the approach used by the Smithsonian for their Solr installation, because getting access to the source databases for the individual entities within the organization is very difficult.  This way they can reindex the online Solr at any time without having to get special permission from all those entities.  When they index new content, it goes into a copy of Solr configured for storage only, not in-depth searching.  Their main Solr instance uses SolrEntityProcessor to import from the intermediate Solr servers, so they can always reindex.
  
+ 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.
+