InvalidSearchBackendError - could not find backend 'oscar_elasticsearch.search.backend':

[arunk]

Hi,
I installed django-oscar-elasticsearch with pip and then added the settings to my settings.py file as described in the README.md file. But when I tried to run migrate I get the following error:

(venv) ➜  shop-cms git:(main) ✗ python manage.py check
Traceback (most recent call last):
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/wagtail/search/backends/__init__.py", line 43, in import_backend
    backend_module = import_module(dotted_path)
  File "/usr/lib/python3.10/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 883, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/oscar_elasticsearch/search/backend.py", line 3, in <module>
    SearchBackend = get_class("search.search", "SearchBackend")
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/oscar/core/loading.py", line 40, in get_class
    return get_classes(module_label, [classname], module_prefix)[0]
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/oscar/core/loading.py", line 50, in get_classes
    return class_loader(module_label, classnames, module_prefix)
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/oscar/core/loading.py", line 120, in default_class_loader
    local_module = _import_module(local_module_label, classnames)
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/oscar/core/loading.py", line 141, in _import_module
    return __import__(module_label, fromlist=classnames)
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/oscar_elasticsearch/search/search.py", line 3, in <module>
    from extendedsearch.backend import SearchBackend
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/extendedsearch/backend.py", line 8, in <module>
    from wagtail.search.backends.elasticsearch6 import (
ModuleNotFoundError: No module named 'wagtail.search.backends.elasticsearch6'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/wagtail/search/backends/__init__.py", line 75, in get_search_backend
    backend_cls = import_backend(backend)
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/wagtail/search/backends/__init__.py", line 50, in import_backend
    raise ImportError from e
ImportError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/arun/Projects/zite69/shop-cms/manage.py", line 22, in <module>
    main()
  File "/home/arun/Projects/zite69/shop-cms/manage.py", line 18, in main
    execute_from_command_line(sys.argv)
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/django/core/management/__init__.py", line 442, in execute_from_command_line
    utility.execute()
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/django/core/management/__init__.py", line 416, in execute
    django.setup()
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/django/apps/registry.py", line 124, in populate
    app_config.ready()
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/oscar_elasticsearch/search/apps.py", line 18, in ready
    self.search_view = get_class("search.views", "CatalogueSearchView")
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/oscar/core/loading.py", line 40, in get_class
    return get_classes(module_label, [classname], module_prefix)[0]
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/oscar/core/loading.py", line 50, in get_classes
    return class_loader(module_label, classnames, module_prefix)
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/oscar/core/loading.py", line 120, in default_class_loader
    local_module = _import_module(local_module_label, classnames)
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/oscar/core/loading.py", line 141, in _import_module
    return __import__(module_label, fromlist=classnames)
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/oscar_elasticsearch/search/views.py", line 13, in <module>
    get_product_search_handler_class = get_class(
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/oscar/core/loading.py", line 40, in get_class
    return get_classes(module_label, [classname], module_prefix)[0]
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/oscar/core/loading.py", line 50, in get_classes
    return class_loader(module_label, classnames, module_prefix)
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/oscar/core/loading.py", line 107, in default_class_loader
    oscar_module = _import_module(oscar_module_label, classnames)
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/oscar/core/loading.py", line 141, in _import_module
    return __import__(module_label, fromlist=classnames)
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/oscar/apps/catalogue/search_handlers.py", line 8, in <module>
    SearchHandler, SearchResultsPaginationMixin = get_classes(
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/oscar/core/loading.py", line 50, in get_classes
    return class_loader(module_label, classnames, module_prefix)
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/oscar/core/loading.py", line 120, in default_class_loader
    local_module = _import_module(local_module_label, classnames)
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/oscar/core/loading.py", line 141, in _import_module
    return __import__(module_label, fromlist=classnames)
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/oscar_elasticsearch/search/search_handlers.py", line 13, in <module>
    SearchBackend = get_search_backend()
  File "/home/arun/Projects/zite69/shop-cms/venv/lib/python3.10/site-packages/wagtail/search/backends/__init__.py", line 77, in get_search_backend
    raise InvalidSearchBackendError(f"Could not find backend '{backend}': {e}")
wagtail.search.backends.InvalidSearchBackendError: Could not find backend 'oscar_elasticsearch.search.backend':

I looked and saw that backend was just a .py file, which defined a SearchBackend class. So I tried changing WAGTAIL_SEARCHBACKENDS["default"]["BACKEND"] to 'oscar_elasticsearch.search.backend.SearchBackend but I still got the same error.

[arunk]

Going through the error it looks like wagtail-extendedsearch package is referring to elasticsearch6.py here but wagtail has updated and no longer has a elasticsearch6.py file as can be seen here