Mapping not updated when field is changed

[leplatrem]

Mapping field types can't be changed apparently.

WARNI  PUT http://localhost:9200/kinto-build-hub-releases/_mapping/kinto-build-hub-releases [status:400 request:0.079s]
ERROR  Unable to notify
Traceback (most recent call last):
  File "/home/mathieu/Code/Mozilla/kinto/kinto/core/events.py", line 89, in _notify_resource_events_after
    request.registry.notify(event)
  File "/home/mathieu/Code/Mozilla/kinto-elasticsearch/.venv/lib/python3.5/site-packages/pyramid/registry.py", line 110, in notify
    [ _ for _ in self.subscribers(events, None) ]
  File "/home/mathieu/Code/Mozilla/kinto-elasticsearch/.venv/lib/python3.5/site-packages/zope/interface/registry.py", line 424, in subscribers
    return self.adapters.subscribers(objects, provided)
  File "/home/mathieu/Code/Mozilla/kinto-elasticsearch/.venv/lib/python3.5/site-packages/zope/interface/adapter.py", line 607, in subscribers
    subscription(*objects)
  File "/home/mathieu/Code/Mozilla/kinto-elasticsearch/.venv/lib/python3.5/site-packages/pyramid/config/adapters.py", line 130, in subscriber_wrapper
    return derived_subscriber(*arg)
  File "/home/mathieu/Code/Mozilla/kinto-elasticsearch/.venv/lib/python3.5/site-packages/pyramid/config/adapters.py", line 103, in derived_subscriber
    return subscriber(arg[0])
  File "/home/mathieu/Code/Mozilla/kinto-elasticsearch/kinto_elasticsearch/listener.py", line 30, in on_collection_updated
    indexer.update_index(bucket_id, collection_id, schema=new_schema)
  File "/home/mathieu/Code/Mozilla/kinto-elasticsearch/kinto_elasticsearch/indexer.py", line 39, in update_index
    body=schema)
  File "/home/mathieu/Code/Mozilla/kinto-elasticsearch/.venv/lib/python3.5/site-packages/elasticsearch/client/utils.py", line 73, in _wrapped
    return func(*args, params=params, **kwargs)
  File "/home/mathieu/Code/Mozilla/kinto-elasticsearch/.venv/lib/python3.5/site-packages/elasticsearch/client/indices.py", line 282, in put_mapping
    '_mapping', doc_type), params=params, body=body)
  File "/home/mathieu/Code/Mozilla/kinto-elasticsearch/.venv/lib/python3.5/site-packages/elasticsearch/transport.py", line 312, in perform_request
    status, headers, data = connection.perform_request(method, url, params, body, ignore=ignore, timeout=timeout)
  File "/home/mathieu/Code/Mozilla/kinto-elasticsearch/.venv/lib/python3.5/site-packages/elasticsearch/connection/http_urllib3.py", line 128, in perform_request
    self._raise_error(response.status, raw_data)
  File "/home/mathieu/Code/Mozilla/kinto-elasticsearch/.venv/lib/python3.5/site-packages/elasticsearch/connection/base.py", line 125, in _raise_error
    raise HTTP_EXCEPTIONS.get(status_code, TransportError)(status_code, error_message, additional_info)
elasticsearch.exceptions.RequestError: TransportError(400, 'illegal_argument_exception', 'mapper [download.url] of different type, current_type [keyword], merged_type [text]')