Backport docs for "Automatically index wikis in elasticsearch"
Backport docs for "Automatically index wikis in elasticsearch"

stoplightio/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq