[Solr Wiki] Update of "SolrPerformanceProblems" by ShawnHeisey

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The "SolrPerformanceProblems" page has been changed by ShawnHeisey:
https://wiki.apache.org/solr/SolrPerformanceProblems?action=diff&rev1=36&rev2=37

Comment:
for switching to SolrCloud, mention possible need to reindex.

  Here is an incomplete list, in no particular order, of how to reduce heap requirements, based on the [[SolrPerformanceProblems#Java_Heap|list above]] for things that require a lot of heap:
  
   * Take a large index and make it distributed - shard your index onto multiple servers.
-   * One very easy way to do this is to switch to SolrCloud.
+   * One very easy way to do this is to switch to SolrCloud.  You may need to [[HowToReindex|reindex]] but SolrCloud will handle all the sharding for you.
    * This doesn't actually reduce the overall memory requirement for a large index (it may actually increase it slightly), but spreads it across multiple servers, so each server will have lower memory requirements.
   * Don't store all your fields, especially the really big ones.
    * Instead, have your application retrieve detail data from the original data source, not Solr.