title: Can Solr DIH do atomic updates?`
body: <p>With Solr 4 came the ability to do atomic (partial) updates on existing documents within the index. I.e. one can match on the document ID and replace the contents of just one field, or add further entries to multivalued fields: <a href="http://wiki.apache.org/solr/Atomic_Updates" rel="noreferrer">http://wiki.apache.org/solr/Atomic_Updates</a></p>
  
  <p>Can atomic updates be done from DataImportHandler (DIH)?</p>