--When I make a search in wagtail using elasticsearch as backend search I 've got the error reported below. I'm using wagtail 1.3.1 with elasticsearch 2.2.0 and django 1.9.1Any help I would appreciate[16/Jan/2016 11:17:57] "GET /static/wagtailadmin/fonts/robotoslab-bold.woff2 HTTP/1.1" 304 0Internal Server Error: /admin/pages/search/Traceback (most recent call last):File "/home/maguimar/django/lib/python3.4/site-packages/django/core/handlers/base.py", line 149, in get_responseresponse = self.process_exception_by_middleware(e, request)File "/home/maguimar/django/lib/python3.4/site-packages/django/core/handlers/base.py", line 147, in get_responseresponse = wrapped_callback(request, *callback_args, **callback_kwargs)File "/home/maguimar/django/lib/python3.4/site-packages/django/views/decorators/cache.py", line 43, in _cache_controlledresponse = viewfunc(request, *args, **kw)File "/home/maguimar/django/lib/python3.4/site-packages/django/contrib/auth/decorators.py", line 23, in _wrapped_viewreturn view_func(request, *args, **kwargs)File "/home/maguimar/django/lib/python3.4/site-packages/django/views/decorators/vary.py", line 21, in inner_funcresponse = func(*args, **kwargs)File "/home/maguimar/django/lib/python3.4/site-packages/wagtail/wagtailadmin/views/pages.py", line 707, in searchpages = Page.objects.all().prefetch_related('content_type').search(q, fields=['title'])File "/home/maguimar/django/lib/python3.4/site-packages/wagtail/wagtailsearch/queryset.py", line 10, in searchsearch_backend = get_search_backend(backend)File "/home/maguimar/django/lib/python3.4/site-packages/wagtail/wagtailsearch/backends/__init__.py", line 65, in get_search_backendparams = conf.copy()AttributeError: 'str' object has no attribute 'copy'[16/Jan/2016 11:18:09] "GET /admin/pages/search/?q=first HTTP/1.1" 500 101481
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My WAGTAILSEARCH_BACKENDS is exactly as you suggest. But I'm using elasticsearch 2.2.0. It will be the elastic 2.2.0 the cause of the error that I reported?