In general, you'll use the JSON defined in the API documentation to build the request. Unfortunately, the Search Event Logs API doc doesn't have sample JSON (I filed an issue) but it does have the fields: https://fusionauth.io/docs/v1/tech/apis/event-logs#search-event-logs
You can also find the EventLogSearchRequest in the client code:
https://github.com/FusionAuth/go-client/blob/master/pkg/fusionauth/Domain.go#L1545
This points at https://github.com/FusionAuth/go-client/blob/master/pkg/fusionauth/Domain.go#L1534
However, I'm not sure searching event logs gets you what you are trying to accomplish:
My goal is to grab all the last events, login..., from a specific user based on his email by example.
You probably want to search login records: https://fusionauth.io/docs/v1/tech/apis/login#search-login-records
https://github.com/FusionAuth/go-client/blob/master/pkg/fusionauth/Domain.go#L3145
https://github.com/FusionAuth/go-client/blob/master/pkg/fusionauth/Domain.go#L3134