java操作es数据进行自定义排序 请给个示例
时间: 2024-03-22 08:37:26 浏览: 71
在Java中操作ES数据进行自定义排序,可以使用ES中的Function Score Query来实现,其中可以通过Script Score来自定义排序。
以下是一个示例代码,假设我们有一个索引名为"my_index",包含以下数据:
```
{
"name": "John Smith",
"age": 30,
"score": 8.5
},
{
"name": "Jane Doe",
"age": 25,
"score": 9.0
},
{
"name": "Bob Johnson",
"age": 35,
"score": 7.5
}
```
现在我们想要按照分数(score)和年龄(age)进行排序,其中分数的权重为0.7,年龄的权重为0.3。那么可以使用以下代码:
```java
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.functionscore.FunctionScoreQueryBuilder;
import org.elasticsearch.index.query.functionscore.ScriptScoreFunctionBuilder;
import org.elasticsearch.script.Script;
import org.elasticsearch.script.ScriptType;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.sort.FieldSortBuilder;
import org.elasticsearch.search.sort.SortBuilders;
import org.elasticsearch.search.sort.SortOrder;
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
Script sortScript = new Script(ScriptType.INLINE, "painless",
"doc['score'].value * 0.7 + doc['age'].value * 0.3", null);
ScriptScoreFunctionBuilder scriptScoreFunctionBuilder =
new ScriptScoreFunctionBuilder(sortScript);
FunctionScoreQueryBuilder functionScoreQueryBuilder =
QueryBuilders.functionScoreQuery(QueryBuilders.matchAllQuery(), scriptScoreFunctionBuilder);
FieldSortBuilder scoreSortBuilder = SortBuilders.fieldSort("score")
.order(SortOrder.DESC);
FieldSortBuilder ageSortBuilder = SortBuilders.fieldSort("age")
.order(SortOrder.DESC);
searchSourceBuilder.query(functionScoreQueryBuilder)
.sort(scoreSortBuilder)
.sort(ageSortBuilder);
SearchRequest searchRequest = new SearchRequest("my_index");
searchRequest.source(searchSourceBuilder);
SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
```
在上面的代码中,我们使用Script Score来计算每个文档的得分,其中分数的权重为0.7,年龄的权重为0.3。然后使用Function Score Query将自定义的得分与其他查询条件结合起来,最后使用Field Sort来按照得分和年龄进行排序。最后执行搜索请求,将结果返回到searchResponse中。
需要注意的是,上面的示例代码中使用了Painless脚本语言来计算得分,如果需要使用其他脚本语言,请根据实际情况修改脚本语言类型和脚本内容。
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