EQL Help - Corrleation

I have the following code under the correlation event tab in kibana:

sequence by @timestamp
 [packetbeat
   where http.response.body.content == "*"
   and network.direction == "*"]

[filebeat
  where nginx.access.response_code == "*"
  and nginx.access.geoip.country_name == "*"]

The query looks ok, but no results are given back when testing.

Any help, please?

I mean, if it s something that i am doing extremely wrong, then please tell me and Iwill try and correct it.

Just checking, with by @timestamp: you expect these events to be logged with exactly the same timestamp?
Also, the == "*" you expect this exact content, or are those placeholders for some other values? As it's not acting as a wildcard.

Do you have example of docs that should match that query?