{
  "query": {
    "bool": {
      "must": [
        {
          "match_phrase": {
            "to_province": "河南"
          }
        },
        {
          "match_phrase": {
            "to_city": "信陽市"
          }
        },
        {
          "match_phrase": {
            "to_district": "新縣"
          }
        },
        {
          "bool": {
            "should": [
              {
                "match_phrase": {
                  "from_city": "商丘市"
                }
              },
              {
                "bool": {
                  "must_not": {
                    "exists": {
                      "field": "from_city"
                    }
                  }
                }
              }
            ]
          }
        }
      ],
      "must_not": [],
      "should": []
    }
  },
  "from": 0,
  "size": 10,
  "sort": [],
  "aggs": {}
}

查詢條件：前面3個是and關系，後面4和5是或者關系，

            ElasticsearchProvider provider = new ElasticsearchProvider();
            ElasticsearchProvider es = new ElasticsearchProvider();

            var elasticsearchPage = new ElasticsearchPage<AreaJiBao>(AreaJiBao.IndexName)
            {
                PageIndex 
 
= 1,
                PageSize = 20
            };


            var searchRequest = elasticsearchPage.InitSearchRequest();
            var predicateList = new List<IPredicate>
            {
                Predicates.Field<AreaJiBao>(x => x.ToProvince, ExpressOperator.Like, "河南省
 
"),
                Predicates.Field<AreaJiBao>(x => x.ToCity, ExpressOperator.Like, "信陽市"),
                Predicates.Field<AreaJiBao>(x => x.ToCity, ExpressOperator.Like, "新縣")
            };
            // 前面3個是 and 關系
            var predicate = Predicates.Group(GroupOperator.And, predicateList.ToArray());

            // FromCity要不包含商丘市，要不就為空值
            var predicateListExists = new List<IPredicate>
            {
                Predicates.Field<AreaJiBao>(x => x.FromCity, ExpressOperator.MustNotExists, null)
            };
            var predicateExists = Predicates.Group(GroupOperator.Or, predicateListExists.ToArray());
            var predicateListTerm = new List<IPredicate>
            {
                Predicates.Field<AreaJiBao>(x => x.FromCity, ExpressOperator.Like, "商丘市")
            };
            var predicateOr = Predicates.Group(GroupOperator.Or, predicateListTerm.ToArray());
            var predicatecCombinationChild = new List<IPredicate> { predicateExists, predicateOr };
            var pgCombinationChild = Predicates.Group(GroupOperator.Or, predicatecCombinationChild.ToArray());


            // 查詢
            var predicatecCombination = new List<IPredicate> { predicate, pgCombinationChild };
            var pgCombination = Predicates.Group(GroupOperator.And, predicatecCombination.ToArray());
            searchRequest.InitQueryContainer(pgCombination);
            var data = provider.SearchPage(searchRequest);
            foreach (var item in data.Documents)
            {
                Console.WriteLine($"{item.Id}");
            }

Elasticsearch.Net 多層嵌套的邏輯實現