如何使用Spring数据与弹性搜索别名进行交互

Question

嗨,我正在使用弹性搜索Spring数据.我的项目的域结构不断变化.所以我必须删除索引才能每次更改映射.为了解决这个问题,我正在使用别名.我用以下方法创建了一个Alias:

elasticsearchTemplate.createIndex(Test.class);
elasticsearchTemplate.putMapping(Test.class);

    String aliasName = "test-alias";
    AliasQuery aliasQuery = new AliasBuilder()
            .withIndexName("test")
            .withAliasName(aliasName).build();

    elasticsearchTemplate.addAlias(aliasQuery);

我有一个测试类:

import org.springframework.data.annotation.Id
import org.springframework.data.elasticsearch.annotations.Document
import org.springframework.data.elasticsearch.annotations.Field
import org.springframework.data.elasticsearch.annotations.FieldIndex
import org.springframework.data.elasticsearch.annotations.FieldType
import org.springframework.data.elasticsearch.annotations.Setting


@Document(indexName = "test", type = "test")
@Setting(settingPath = 'elasticSearchSettings/analyzer.json')
class Test  extends BaseEntity{

@Id
@Field(type = FieldType.String, index = FieldIndex.not_analyzed)
String id

@Field(type = FieldType.String, index = FieldIndex.analyzed, indexAnalyzer = "generic_analyzer", searchAnalyzer = "generic_analyzer")
String firstName



}

TestRepository类:

package com.as.core.repositories

import com.as.core.entities.Test
import org.springframework.data.elasticsearch.repository.ElasticsearchRepository

interface TestRepository extends ElasticsearchRepository<Test, String>          
{


}

我的问题是如何从别名而不是索引本身读取？写操作是否也发生在别名上.我查看了以下链接:https: //www.elastic.co/guide/en/elasticsearch/guide/current/index-aliases.html#index-aliases 它说我们必须交互别名而不是实际如何使用Elasticsearch Spring数据Java API实现这一目标.

Answer 1

我通过在与对象关联的存储库类中使用ElasticsearchTemplate解决了这个限制(尽管如果有一种方法可以在实体本身上指定别名,那就更好了).

它的工作方式是创建自定义存储库接口.在你的情况下,它将是TestRepositoryCustom:

public interface TestRepositoryCustom
{
    Test> findByCustom(...);
}

然后实现此接口,将"Impl"附加到基本存储库名称的末尾:

public class TestRepositoryImpl implements TestRepositoryCustom
{
    Page<Test> findByCustom(Pageable pageable, ...)
    {
        BoolQueryBuilder boolQuery = new BoolQueryBuilder();
        FilterBuilder filter = FilterBuilders.staticMethodsToBuildFilters;
        /*
         * Your code here to setup your query
        */

        NativeSearchQueryBuilder builder = new NativeSearchQueryBuilder().withQuery(boolQuery).withFilter(filter).withPageable(pageable); 

        //These two are the crucial elements that will allow the search to look up based on alias
        builder.withIndices("test-alias");
        builder.withTypes("test");

        //Execute the query
        SearchQuery searchQuery = builder.build();
        return elasticSearchTemplate.queryForPage(searchQuery, Test.class);
    }
}

最后,在您的基础JPA repsitory接口TestRepository中,扩展TestRepositoryCustom接口,以便从您的存储库bean访问自定义接口上的任何方法.

public interface TestRepository extends ElasticsearchRepository<Consultant, String>, TestRepositoryCustom
{
}

我真的希望看到的是对实体的注释,如:

@Document(aliasName="test-alias")

这将在后台工作,以提供从门上搜索此索引,以便所有jpa查询都可以正常工作,无论索引名称如何.