Logstash output script not working: Append array while upserting

Elastic Stack Logstash
5

Thanks @ToddDtown for your reply, but not sure what else to put where.
Didn't fix my issue.

In addition your idea might lead to multiple entries of the same value, I guess.

My solution now is to restructure and use a nested field with integers.

"origin": {
  "live": 1
  "upload": 1
},

so in the logstash config I just need this:

mutate {
    add_field => { "[origin][upload]" => 1 }
}
mutate {
    convert => ["[origin][upload]","integer"]
}

where the 2nd part is "just" to ensure having a integer instead of a string.