Map nested fields of object from Logstash to Elasticsearch (Kibana Forum)

[kejsi]

Map nested fields of object from Logstash to Elasticsearch

Guys hello
I posted this on ES forum and they told me to get in here for best results!!

I have an object which looks like this:

"dummyObj":"{"id":6,"nrs":[1,2,3,4]}"

I supply this object from Log4j2 using JsonLayout. Moreover, I have created an index in Elasticsearch like this:

{
"mappings": {
        "dummy": {
                "properties": { 
                        "parsedDummyObj": {
                            "type": "nested",
                            "properties": {
                                "id": { "type": "text" },
                                "numbers": { "type": "text" }
                            }
                        }
                }                                                                                          
        }
}
}

Now, in Logstash I do this:

filter {

  json {
        source => "dummyObj"
        target => "parsedDummyObj"
        remove_field=>["dummyObj"]
    }
}

However, I get the error: object mapping [parsedDummyObj] can't be changed from nested to non-nested"

My question is: what type of filter/mapping should I use, for the json (dummyObj), to be added successfully in Elasticsearch?

PS: I have researched, and I know the answer may implicitly exist out there, but I am extremely too knew to Elastic and hope for your understanding.