assertNotNull(response);
    }

    @Test
    public void test_addField() throws Exception {
        indexItems();

        PopularWordsResponse response = suggester.popularWords().addField("content").execute().getResponse();

        assertNotNull(response);
    }

    @Test
    public void test_addExcludeWord() throws Exception {
        indexItems();

        assertEquals(1, response.getNum());
    }

    @Test
    public void test_addField() throws Exception {
        indexItems();

        SuggestResponse response = suggester.suggest().setQuery("test").addField("content").execute().getResponse();

        assertNotNull(response);
    }

    @Test
    public void test_addKind() throws Exception {
        indexItems();

    }

    @Test
    public void test_addField() throws Exception {
        indexQueryItems();

        PopularWordsResponse response = suggester.popularWords().setSize(10).addField("content").execute().getResponse();

        assertNotNull(response);
        assertTrue(response.getTotal() > 0);
    }

    @Test
    public void test_addLanguage() throws Exception {

 * suggestRequest.setIndex("my_index");
 * suggestRequest.setQuery("example query");
 * suggestRequest.setSize(5);
 * suggestRequest.addTag("tag1");
 * suggestRequest.addRole("role1");
 * suggestRequest.addField("field1");
 * suggestRequest.addKind("kind1");
 * suggestRequest.addLang("en");
 * suggestRequest.setSuggestDetail(true);
 * suggestRequest.setReadingConverter(new MyReadingConverter());

            final SuggestRequestBuilder builder = suggestHelper.suggester().suggest();
            builder.setQuery(parameter.getQuery());
            stream(parameter.getSuggestFields()).of(stream -> stream.forEach(builder::addField));
            roleQueryHelper.build(SearchRequestType.SUGGEST).stream().forEach(builder::addRole);
            builder.setSize(parameter.getNum());
            stream(langs).of(stream -> stream.forEach(builder::addLang));

    @Test
    public void test_addRole() {
        request.addRole("role1");
        request.addRole("role2");
    }

    @Test
    public void test_addField() {
        request.addField("field1");
        request.addField("field2");
    }

    @Test
    public void test_addKind() {
        request.addKind("DOCUMENT");
        request.addKind("QUERY");
    }

    @Test

                stream(baseRoles).of(stream -> stream.forEach(role -> popularWordsRequestBuilder.addRole(role)));
                stream(baseFields).of(stream -> stream.forEach(field -> popularWordsRequestBuilder.addField(field)));
                stream(baseExcludes).of(stream -> stream.forEach(exclude -> popularWordsRequestBuilder.addExcludeWord(exclude)));
                try {

  
  This change implements a deep copy of the `Fields` map for each composition environment, ensuring thread safety.
  
  ### Issue