This appears to be covered here: http://docs.wagtail.io/en/v2.0.1/advanced_topics/settings.html - cross check all settings
Refer to Django settings - https://docs.djangoproject.com/en/2.0/ref/settings/
wagtail/docs/howto/settings.rst
See details at wagtail/wagtail#2127
wagtail/docs/howto/settings.rst
wagtail/docs/contrib_components/frontendcache.rst http://docs.wagtail.io/en/v2.0.1/reference/contrib/frontendcache.html
WAGTAILFRONTENDCACHE_LOCATION and the WAGTAILSEARCH_RESULTS_TEMPLATE settings are only around for backwards compatibility and may also be removed at some point in the future.
which may be removed soon, so probably not worth documenting)
wagtail/docs/core_components/images/feature_detection.rst wagtail/docs/getting_started/installation.rst
wagtail/docs/howto/settings.rst wagtail/docs/releases/0.5.rst
wagtail/docs/core_components/search/backends.rst wagtail/docs/core_components/search/indexing.rst wagtail/docs/getting_started/installation.rst wagtail/docs/howto/settings.rst wagtail/docs/reference/management_commands.rst wagtail/docs/releases/0.7.rst
wagtail/docs/core_components/search/searching.rst wagtail/docs/howto/settings.rst WAGTAILFRONTENDCACHE_LOCATION and the WAGTAILSEARCH_RESULTS_TEMPLATE settings are only around for backwards compatibility and may also be removed at some point in the future.
wagtail/docs/core_components/search/searching.rst wagtail/docs/howto/settings.rst
wagtail/docs/howto/settings.rst http://docs.wagtail.io/en/v2.0.1/getting_started/integrating_into_django.html#settings
wagtail/docs/releases/0.5.rst
Refer wagtail/wagtail#726