@BeforeEach
  void elasticseachInit() throws IOException {
    Map<String, String> model = ImmutableMap.<String, String>builder()
            .put("string", "keyword")
            .put("optionalString", "keyword")
            .put("bool", "boolean")
            .put("intNumber", "integer")
            .build();

    new IndexOps(restClient, MAPPER, "test").create(model).blockingAwait();

    ElasticsearchBackend backend = backend();
    ElasticsearchOps ops = new ElasticsearchOps(restClient, "test", MAPPER, 1024);
    for (int i = 0; i < SIZE; i++) {
      ObjectNode doc = MAPPER.createObjectNode()
              .put("string", "s" + i)
              .put("bool", true)
              .put("intNumber", i);

      WriteResult result = ops.insertDocument(doc).blockingGet();
    }
  }
Should be greater than default elastic {@code size} which is 10.
@see <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/search-request-from-size.html">from-size</a>
criteria/elasticsearch/test/org/immutables/criteria/elasticsearch/ScrollingTest.java