[indexer] Set SQL NULL as Solr empty values so that rows with NULL cells are still indexed
@@ -278,6 +278,7 @@ def _small_indexing(user, fs, client, source, destination, index_name):
if client.is_solr_six_or_more():
kwargs['processor'] = 'tolerant'
+ kwargs['map'] = 'NULL:'
try:
if source['inputFormat'] == 'query':
