彈性搜索5.x中嵌套多個查詢C＃

Question

我使用C＃與的NuGet packeges;

<package id="Elasticsearch.Net" version="5.2.0" targetFramework="net462" /> 
    <package id="NEST" version="5.2.0" targetFramework="net462" /> 
    <package id="Newtonsoft.Json" version="9.0.1" targetFramework="net462" /> 

我想在這裏做什麼，我想在價格區間2000「白色」項目 - 3000這是針對搜索API一個簡單的請求，對嗎？

所以我寫了一個代碼這一點。這裏是;

private static void Search(IElasticContext elasticContext, string indexName) 
    { 
     IQueryContainer termQueryContainer = new QueryContainer(); 
     termQueryContainer.Term = new TermQuery 
            { 
             Field = new Field("description"), 
             Value = "white" 
            }; 

     IQueryContainer rangeQueryContainer = new QueryContainer(); 
     rangeQueryContainer.Range = new NumericRangeQuery 
            { 
             Field = new Field("price"), 
             LessThanOrEqualTo = 3000, 
             GreaterThanOrEqualTo = 2000 
            }; 

     //Should get 2 items. 

     SearchRequest<Product> searchRequest = new SearchRequest<Product>(indexName, typeof(Product)) 
               { 
                Size = 10, 
                From = 0, 
                Query = (QueryContainer) rangeQueryContainer, 
                PostFilter = (QueryContainer) termQueryContainer 
               }; 

     EsSearchResponse<Product> response = elasticContext.Search<Product>(searchRequest); 

     Console.WriteLine(response.StatusMessage); 

     if (response.IsValid) 
     { 
      foreach (Product product in response.Documents) 
      { 
       Console.WriteLine("Id: {0} | Name: {1}", product.Id, product.Name); 
      } 
     } 
    } 

但它不工作，因爲請求已經全成但在結果沒有文件（S），但我有。我可以用Sense插件查看文檔。

如果合併兩個查詢，鳥巢將扔在運行時異常（表示：「QueryContainer只能容納一個查詢中已經包含了TermQuery」）。這裏是;

而且，我無法用流利的API，因爲我傳遞參數給我的倉庫般的功能;

EsSearchResponse<Product> response = elasticContext.Search<Product>(searchRequest); 

我如何（在描述字段2000-3000之間&價格範圍搜索）在鳥巢的dll SearchRequest結合兩個簡單的查詢。我做錯了什麼？

Answer 1

你試圖做的是從兩個查詢，在這兩個查詢必須由一個文件，以滿足它被認爲是匹配形成一個複合查詢。 A bool query is used to combine queries in this manner，使用must子句來指定必須滿足兩個查詢。下面是一個例子，與對象初始化語法

var client = new ElasticClient(); 
var indexName = "index-name"; 
var mustClauses = new List<QueryContainer>(); 

mustClauses.Add(new TermQuery 
{ 
    Field = new Field("description"), 
    Value = "white" 
}); 

mustClauses.Add(new NumericRangeQuery 
{ 
    Field = new Field("price"), 
    LessThanOrEqualTo = 3000, 
    GreaterThanOrEqualTo = 2000 
}); 

var searchRequest = new SearchRequest<Product>(indexName) 
{ 
    Size = 10, 
    From = 0, 
    Query = new BoolQuery { Must = mustClauses } 
}; 

var searchResponse = client.Search<Product>(searchRequest); 

隨着range查詢，文檔或者是用於查詢條款或不匹配，所以我們就可以把它作爲一個放棄被計算爲查詢分數bool查詢filter條款

var indexName = "index-name"; 
var mustClauses = new List<QueryContainer>(); 
var filterClauses = new List<QueryContainer>(); 

mustClauses.Add(new TermQuery 
{ 
    Field = new Field("description"), 
    Value = "white" 
}); 

filterClauses.Add(new NumericRangeQuery 
{ 
    Field = new Field("price"), 
    LessThanOrEqualTo = 3000, 
    GreaterThanOrEqualTo = 2000 
}); 

var searchRequest = new SearchRequest<Product>(indexName) 
{ 
    Size = 10, 
    From = 0, 
    Query = new BoolQuery 
    { 
     Must = mustClauses, 
     Filter = filterClauses 
    } 
}; 

var searchResponse = client.Search<Product>(searchRequest);