Document_id in redis

My input comes from a rest service that is digging in a database. Every time I request the service, I get events from the last 24 hours (for instance). That means, when I request the service every hour I will get a few same events as that got already with the last request.

I've learned that elesticsearch will override double events when the _id is the same. OK, then I try to set the document_id.
I send the data via a redis server. How can I set document_id in the config?

input {
stdin { }

exec {
 codec => json
 command => "C:\Data\RequestRest.exe"
 interval => 20  


filter {
split {
field => "results"

date {
match => ["[results][StartTime]","yyyy-MM-dd'T'HH:mm:ss.SSS"]
timezone => "UTC"

mutate {
add_field => {
"log_domain" => "cio"
"log_component" => "disflower_input_test"

output {
redis { host => "log4all-redis-sandbox.europe.intranet:6379"
data_type => "list"
key => "logstash"

stdout { 
    codec => rubydebug

} is what you want, but you set that when you send to ES, not to redis.

I know. But problem is, that I do not send to ES but to Redis. Question again: How to set id then?

Redis has no ID, it is just a list.