I am working on a offline tagging capability to tag records with a thesaurus dictionary of key concepts. I am able to use the update="add" option using xml and json update calls for a field to update specific document field information. Although if I run the same atomic update query twice then the multivalued string fields start showing duplicate value in the multivalued field. e.g. for a field name as tag at the initial it was having copper, iron, steel After running the atomic update query with <field name="tag" update="add">steel</field> I will get the tag field values as following: copper, iron, steel, steel. (Thus steel get added twice). I looked at RemoveDuplicatesTokenFilterFactory but it helps to remove token duplicate not multivalued field duplicates. Is there any updateProcessor to stop the incoming duplicate value from indexing ?
Thanks in advance for any help. Regards Anupam
