Add note to Backend Support docs about lack of ES 5.X support. (#1457)
Add note to Backend Support docs about lack of ES 5.X support. (#1457)


celerityweb/django-haystack,celerityweb/django-haystack,sgaist/django-haystack,sgaist/django-haystack,sgaist/django-haystack,barseghyanartur/django-haystack,barseghyanartur/django-haystack,barseghyanartur/django-haystack,celerityweb/django-haystack