[Solr Wiki] Update of "UpdateCSV" by MichaelLabib

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The "UpdateCSV" page has been changed by MichaelLabib:
https://wiki.apache.org/solr/UpdateCSV?action=diff&rev1=21&rev2=22

  == Disadvantages ==
  There is no way to provide document or field index-time boosts with the CSV format, however many indicies do not utilize that feature.
  
+ Because the UpdateCSV handler functions at a lower level than the DataImportHandler (DIH), built in features that the DIH provides such as Transformers, EntityProcessors and Import commands aren't available when using UpdateCSV. With that said, additional consideration should be made on the data format provided within the CSV file and how it gets consumed by your solr schema. 
+ 
+ Unlike DIH, there isn't a queryable way to know the status of the import after its been executed.  
+ 
  == Tab-delimited importing ==
  Don't let the "CSV" name fool you, this loader can load your tab-delimited files, and even handle backslash escaping rather than CSV encapsulation.