[arangodb-google] Update some fields based on another field

[Iro]

I want to update some fileds in a document but without knowing "_key"

I want to make a query as in Mysql or Oracle 

mysql
UPDATE users 
  SET name = "John Smith"
  WHERE email= "t...@test.com";

arangodb first try
UPDATE  { email: "t...@test.com"}
WITH { name: "JohnSmith"}
in users 
(error showed Query: AQL: missing document key (while executing))

arangodb second try
REPLACE{ email: "t...@test.com"}
WITH { name: "JohnSmith"}
in users 
(error showed Query: AQL: missing document key (while executing))

Where to find more information about this issue and how can i make this 
query

Best

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