@Test
void implementRelationOperatorOnly() {

  when(settings.getSettingValue(Settings.Key.QUERY_SIZE_LIMIT)).thenReturn(200);
  String indexName = "test";
  LogicalPlan plan = relation(indexName);
  Table index = new ElasticsearchIndex(client, settings, indexName);
  assertEquals(
      new ElasticsearchIndexScan(client, settings, indexName, exprValueFactory),
      index.implement(plan));
}