Use HttpURLConnection to send a "GET" command to Elastic Search with a json body (enum "-d" option in curl's GET)

Recently I was working on implementing a java equivalence using HttpURLConnection to the following curl query which sends a "GET" command to elastic search with a json body specified in the "-d" option of curl command, something like the one below:

curl -XGET "http://127.0.0.1:9200/messages/_search?pretty" -d '
{
  "size" : 10,
  "query" : {
    "bool" : {
      "must" : [ {
        "match" : {
          "id" : {
            "query" : "[some id]",
            "type" : "boolean"
          }
        }
      },  {
        "nested" : {
          "query" : {
            "bool" : {
              "must" : {
                "match" : {
                  "agent" : {
                    "query" : "[some agent name]",
                    "type" : "boolean"
                  }
                }
              }
            }
          },
          "path" : "agents"
        }
      } ]
    }
  }
  }
}

The command requires a json body to be sent to the elastic search via the "GET" restful call. After some trial and error, I got this to work, below is the method implemented in Java.

 public static String httpGet(String urlToRead, String data) {
        URL url;
        HttpURLConnection conn;
        BufferedReader rd;
        String line;
        StringBuilder result = new StringBuilder();
        try {
            url = new URL(urlToRead);
            conn = (HttpURLConnection) url.openConnection();
            conn.setDoOutput(true);
            conn.setRequestMethod("GET");
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(conn.getOutputStream()));
            writer.write(data);
            writer.flush();

            rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            while ((line = rd.readLine()) != null) {
                result.append(line);
            }
            rd.close();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result.toString();
}

To call the above method and realize the curl query to ES above. just implement the following:

 
int size = 10;
String ipAddress = "127.0.0.1";
String url = "http://"+ipAddress+":9200/messages/_search?pretty";
String data = " { \"size\" : "+size+", \"query\" : { \"bool\" : { \"must\" : [ { \"match\" : { \"id\" : { \"query\" : \"[some id]\", \"type\" : \"boolean\" } } }, { \"nested\" : { \"query\" : { \"bool\" : { \"must\" : { \"match\" : { \"agent\" : { \"query\" : \"[some agent name]\", \"type\" : \"boolean\" } } } } }, \"path\" : \"agents\" } } ] } } } ";
String response = httpGet(url, data);