ElasticSearch命中没有字段

Question

我有一个问题，当我运行一个使用java api的弹性搜索时，我得到的结果...但是当我尝试从结果中提取值时没有字段。

ElasticSearch V5.3.1

弹性API：org.elasticsearch.client：运输V5.3.0

我的代码：

SearchRequestBuilder srb = client.prepareSearch("documents").setTypes("documents").setSearchType(SearchType.QUERY_THEN_FETCH).setQuery(qb).setFrom(0).setSize((10)).setExplain(false); 

srb.addDocValueField("title.raw"); 
SearchResponse response = srb.get(); 

response.getHits().forEach(new Consumer<SearchHit>() { 

     @Override 
     public void accept(SearchHit hit) { 
      System.out.println(hit); 
      Map<String, SearchHitField> fields = hit.getFields(); 

      Object obj = fields.get("title.raw").getValue(); 

     } 

    }); 

当在foreach运行OBJ总是回来空。 Fields有一个关键字title.raw的项目，它有一个SearchHitField。

Answer 1

字段仅在您尝试获取存储字段时使用。默认情况下，您应该使用源获取字段。用下面的代码示例我会试着解释它。

PUT documents 
{ 
    "settings": { 
    "number_of_replicas": 0, 
    "number_of_shards": 1 
    }, 
    "mappings": { 
    "document": { 
     "properties": { 
     "title": { 
      "type": "text", 
      "store": true 
     }, 
     "description": { 
      "type": "text" 
     } 
     } 
    } 
    } 
} 

PUT documents/document/_bulk 
{"index": {}} 
{"title": "help me", "description": "description of help me"} 
{"index": {}} 
{"title": "help me two", "description": "another description of help me"} 

GET documents/_search 
{ 
    "query": { 
    "match": { 
     "title": "help" 
    } 
    }, 
    "stored_fields": ["title"], 
    "_source": { 
    "includes": ["description"] 
    } 
} 

接下来的回应，请注意存储的字段标题和正常字段说明之间的区别。

{ 
    "_index": "documents", 
    "_type": "document", 
    "_id": "AVuciB12YLj8D0X3N5We", 
    "_score": 0.14638957, 
    "_source": { 
    "description": "another description of help me" 
    }, 
    "fields": { 
    "title": [ 
     "help me two" 
    ] 
    } 
}