How to connect to ElasticSearch using Java transport client?

I am following ElasticSearch documentation on Java Client. I have ElasticSearch started and can interact with it using the Rest API. I want to use a Java client, so far I have a body like this:

public class TestElastic {

public static void main(String[] args) {
    try{
        TransportClient client = TransportClient.builder().build()
        .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("127.0.0.1"), 9300));
        JSONObject place = new JSONObject();
        place.put("name", "AAAAA");
        IndexResponse response = client.prepareIndex("my_database", "places", "1")
                .setSource(place)
                .get();
        System.out.println(response.toString());
        // Index name
        String _index = response.getIndex();
        System.out.println(_index);
        // Type name
        String _type = response.getType();
        System.out.println(_type);
        // Document ID (generated or not)
        String _id = response.getId();
        System.out.println(_id);
        // Version (if it's the first time you index this document, you will get: 1)
        long _version = response.getVersion();
        System.out.println(_version);
        // isCreated() is true if the document is a new one, false if it has been updated
        boolean created = response.isCreated();
        System.out.println(created);
        client.close();
    }catch (Exception ex){
        ex.printStackTrace();
    }
}

}

In the Java log, I can see the connection to 127.0.0.1:9300. But after the "prepare index" command, I don't see any errors and nothing is printed (I have some system output commands). There is also no relative relationship in ElasticSearch logs. When I create an index using Rest API, I can see it in the logs.