spring - 如何使用 spring-data-elasticsearch 创建建议查询？

Question

我想建立一个建议查询，如下所述:
https://www.elastic.co/guide/en/elasticsearch/reference/2.4/search-suggesters.html#search-suggesters

{
  "query" : {
    ...
  },
  "suggest" : {
    ...
  }
}

我如何使用 spring-data-elasticsearch 做到这一点？我在 NativeSearchQueryBuilder 类中找不到此类查询的任何 setter 。

我不想使用原生 json，因为在使用构建器模式构建复杂查询时它会让人不舒服。

Answer 1

举个简短​​的例子 - 在 sample 上有以下映射索引和 test类型:

 "test": {
    "properties": {
        "description": {"type": "keyword"}
    }
}

和索引的文档:

{ "description": "blue sky"}

我想咨询一下:

{
  "query" : {
    "match": {
      "description": "blue sky"
    }
  },
  "suggest" : {
    "my-suggest-1" : {
      "text" : "blue sk",
      "term" : {
        "field" : "description"
      }
    }
  }
}

在 Java API 中，您需要向 SearchRequestBuilder 添加 bool 查询和建议:

BoolQueryBuilder boolQuery = QueryBuilders.boolQuery()
                .must(QueryBuilders.matchQuery ("description", "blue sky"));

SuggestionBuilder suggestionBuilder = 
    new TermSuggestionBuilder("description").text("blue sk");                
SuggestBuilder suggestion = 
    new SuggestBuilder().addSuggestion("my-suggest-1", suggestionBuilder);

SearchRequestBuilder builder = client.prepareSearch("sample")
        .setTypes("test")
        .setQuery(boolQuery)
        .suggest(suggestion);

SearchResponse searchResponse;
try {
    searchResponse = builder.execute().get();

    for (SearchHit hit : searchResponse.getHits().getHits()) {
        LOG.info("Result: " + hit.getSourceAsString());
    }
} catch (InterruptedException | ExecutionException e) {
    LOG.error("Exception while executing query {}", e);
}

当您调试 searchResponse 对象时，它看起来像这样:

{
   "took":2,
    ...,
   "hits":{
      "total":1,
      "max_score":0.2876821,
      "hits":[
         {
            "_index":"sample",
            "_type":"test",
            "_id":"AV1b42zWa7i_qjvIODcL",
            "_score":0.2876821,
            "_source":{
               "description":"blue sky"
            }
         }
      ]
   },
   "suggest":{
      "my-suggest-1":[
         {
            "text":"blue sk",
            "offset":0,
            "length":7,
            "options":[
               {
                  "text":"blue sky",
                  "score":0.85714287,
                  "freq":1
               }
            ]
         }
      ]
   }
}