ElasticSearch使用GET API,我们可以使用文档ID查询特定文档的单个索引。从Elasticsearch 5.1开始,GET API支持在别名上查询文档,可以指向多个索引,如下所示:
GET /my_alias_name/_search/
{
"query": {
"bool": {
"filter": {
"term": {
"_id": "AUwNrOZsm6BwwrmnodbW"
}
}
}
}
}
用于实现此目的的相应JAVA API是什么(使用JestClient ...)?
1)客户创建:
JestClientFactory factory = new JestClientFactory();
factory.setHttpClientConfig(new HttpClientConfig.Builder("http://localhost:9200")
.multiThreaded(true)
.build());
JestClient jestClient = factory.getObject();
2)准备搜索请求:
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.boolQuery().filter(QueryBuilders.termQuery("_id", "AUwNrOZsm6BwwrmnodbW")));
Search search = new Search.Builder(searchSourceBuilder.toString())
.addIndex("my_alias_name") -> Add index name or an alias.
.addType("my_type") -> Add index type here.
.build();
3)执行搜索:
SearchResult result = jestClient.execute(search);
注意:我们可以添加别名来代替索引名称,它的工作方式相同。