It seems to be the Clinton emails - https://wikileaks.org/clinton-emails/

For example, a search for the word "slice" returns the screenshot email:

https://wikileaks.org/clinton-emails/?q=slice&mfrom=&mto=&title=¬itle=&date_from=&date_to=&nofrom=¬o=&count=50&sort=0#searchresult

It seems to be the Clinton emails - https://wikileaks.org/clinton-emails/

For example, a search for the word "slice" returns the screenshot email:

https://wikileaks.org/clinton-emails/?q=slice&mfrom=&mto=&title=&notitle=&date_from=&date_to=&nofrom=&noto=&count=50&sort=0#searchresult

And, a search for the character string, "clintonernail" returns a number of results including the screenshot email:

https://wikileaks.org/clinton-emails/?q=clintonernail&mfrom=&mto=&title=&notitle=&date_from=&date_to=&nofrom=&noto=&count=50&sort=0#searchresult