Traceback (most recent call last):
File "./hooks/upgrade-charm", line 28, in <module>
main()
File "/usr/local/lib/python3.5/dist-packages/charms/reactive/__init__.py", line 69, in main
bus.discover()
File "/usr/local/lib/python3.5/dist-packages/charms/reactive/bus.py", line 409, in discover
_register_handlers_from_file(search_path, filepath)
File "/usr/local/lib/python3.5/dist-packages/charms/reactive/bus.py", line 439, in _register_handlers_from_file
_load_module(root, filepath)
File "/usr/local/lib/python3.5/dist-packages/charms/reactive/bus.py", line 427, in _load_module
return importlib.import_module(package + module)
File "/usr/lib/python3.5/importlib/__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 986, in _gcd_import
File "<frozen importlib._bootstrap>", line 969, in _find_and_load
File "<frozen importlib._bootstrap>", line 958, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 673, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 665, in exec_module
File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
File "/var/lib/juju/agents/unit-pdl-api-8/charm/hooks/relations/elasticsearch/requires.py", line 6, in <module>
class ElasticsearchRequires(Endpoint):
File "/var/lib/juju/agents/unit-pdl-api-8/charm/hooks/relations/elasticsearch/requires.py", line 9, in ElasticsearchRequires
'endpoint.{relation_name}.changed.cluster_name')
File "/usr/local/lib/python3.5/dist-packages/charms/reactive/decorators.py", line 96, in _when_decorator
flags = _expand_endpoint_name(endpoint_name, desired_flags)
File "/usr/local/lib/python3.5/dist-packages/charms/reactive/decorators.py", line 292, in _expand_endpoint_name
return tuple(flag.format(endpoint_name=endpoint_name) for flag in flags)
File "/usr/local/lib/python3.5/dist-packages/charms/reactive/decorators.py", line 292, in <genexpr>
return tuple(flag.format(endpoint_name=endpoint_name) for flag in flags)
KeyError: 'relation_name'