gistfile1.java

import org.apache.flume.sink.elasticsearch.ContentBuilderUtil;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentFactory;

public class JsonPlay {
  public static void main(String[] args) throws Exception {
    XContentBuilder strangeBuilder = XContentFactory.jsonBuilder().startObject();
    ContentBuilderUtil.appendField(strangeBuilder, "data", "1\t{\"areYouSure\":\"thatItisvalidJson\"}".getBytes());

    System.out.println(strangeBuilder.bytes().toUtf8());

    XContentBuilder straightBuilder = XContentFactory.jsonBuilder().startObject();
    ContentBuilderUtil.appendField(straightBuilder, "data", "it is not json because don't contains brackets".getBytes());

    System.out.println(straightBuilder.bytes().toUtf8());
  }
}

/*
{"data":"org.elasticsearch.common.xcontent.XContentBuilder@560088f"}
{"data":"it is not json because don't contains brackets"}
*/