def rename_field(src, dst, q=None):
# TODO do this using the scroll API http://www.elasticsearch.org/guide/reference/api/search/search-type/
everything = Journal.query(q=q, size=10000000)
try:
if everything['hits']['total'] <= 0:
raise Exception('Nothing to rename')
except KeyError:
print 'ES returned a strange result, probably an error. Is ' \
'your index missing? Here is the original response:' \
'\n ', everything
for record in everything['hits']['hits']:
instance = Journal(**record['_source'])
if src not in instance:
# The field we're renaming is not in this record. Move on.
continue
elif src in instance and dst in instance:
# If both source and destination are present, merge them as
# a list.
new_data, instance[dst] = Journal.make_merge_list(
instance[dst], instance[src]
)
else:
instance[dst] = instance[src]
del instance[src] # delete original field
instance.save()
Journal.refresh()
return everything['hits']['total']
