creating new fields while adding events to the splunk's receivers endpoint

I set the key=value pairs into the body of the REST HTTP request directly using Java REST SDK API.

Example :

RequestMessage reqMsg = new RequestMessage();

reqMsg.setMethod("post");

reqMsg.getHeader().put("x-splunk-input-mode", "streaming");

reqMsg.setContent("hater = yes, nothater = no");

Then i send the message to the simple reciever rest endpoint.

String path = "/services/receivers/simple?host=localhost&index=main&source=addfields&sourcetype=addedfields";

ResponseMessage resMsg = authService.send(path,reqMsg);

Then, When i opened the search app to see the added data, i saw both the new fields and the raw data which is the key=value pairs that i set directly added.

I only want to see the added key=value pairs below the raw data, not together with the raw data. When i tried adding the raw data and the key=value pairs to the content body of rest http request like this using java rest sdk api,

reqMsg.setContent("rawdata1 - hater = yes, nothater = no");

i see this added on the search app.

rawdata1 - hater = yes, nothater = no (for the added raw data value)

the new fields hater and nohater are added below the raw field. I just want the rawdata1 as the raw data value. Has it to be done using Java logging framework if i'm using java.