[Solr Wiki] Update of "SolrCaching" by NoblePaul

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The following page has been changed by NoblePaul:
http://wiki.apache.org/solr/SolrCaching

The comment on the change is:
cleanupThread  doc added

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  == acceptableSize (optional) ==
  Only applicable for `FastLRUCache` . When the cache removes old entries , it targets to achieve the `minSize` . If not possible it atleast tries to bring it down to `acceptableSize`.If not mentioned the default value will be `0.95 * size` . 
  
+ 
+ == cleanupThread (optional) ==
+ Only applicable for `FastLRUCache` . Default is set to false. If set to true , the cleanup will be run in a dedicated separate thread. When the cleanup is fired (i.e when cache size reaches upper water mark) the particular request can take very long time if this is not set to true.
  
  = Types of Caches and Example Configuration =