Put a mapping using java api not working

Elastic Stack Elasticsearch
1

hi,

can you quickly spot any errors in my code? it fails with root type not
empty

XContentBuilder mapping = null;
    try {
        mapping = jsonBuilder()
                .startObject()
                .startObject("message")
                .startObject("_parent")
                .field("type", "chat")
                .endObject()
                .endObject()
                .endObject();
    } catch (IOException e) {
        e.printStackTrace();
    }

    PutMappingResponse putMappingResponse = client.admin().indices()
            .preparePutMapping("messages")
            .setType("chat")
            .setSource(mapping)
            .execute().actionGet();
}

messages=index
chat=parent document
message=child document

error = Root type mapping not empty after parsing! Remaining fields:
[message : {_parent={type=chat}}]

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