title: Solr/SolrNet: How can I update a document given a document unique ID?
body: <p>I need to update few fields of each document in Solr index separately from the main indexing process. According to documentation "Create" and "Update" are mapped onto the "Add()" function. <a href="http://code.google.com/p/solrnet/wiki/CRUD" rel="nofollow">http://code.google.com/p/solrnet/wiki/CRUD</a></p>
  
  <p>So if I add a document which already exist, will it replace the entire document or just the fields that I have specified? </p>
  
  <p>If it'll replace the entire document then the only way that I can think of in order to update  is to search the document by unique id, update the document object and then "Add" it again. This doesn't sound feasible because of the frequency of update ops required. Is there a better way to update?</p>
  
  <p>Thanks!</p>