code: public void markForDeduplication(KeyspaceImpl keyspace, String index, ConceptId conceptId) {
          Attribute attribute = Attribute.create(keyspace, index, conceptId);
          LOG.trace("insert({})",  attribute);
          queue.insert(attribute);
      }
docs: Marks an attribute for deduplication. The attribute will be inserted to an internal queue to be processed by the de-duplicator daemon in real-time.
  The attribute must have been inserted to the database, prior to calling this method.
  
  @param keyspace keyspace of the attribute
  @param index the value of the attribute
  @param conceptId the concept id of the attribute