ElasticSearch java API 使用 item id 跨索引（使用别名）获取多个文档

Question

ElasticSearch has GET API using which we can query on a single index for a particular document using the document Id. From Elasticsearch 5.1, GET API supports querying on documents on an alias too that can point to multiple indexes like this:

GET /my_alias_name/_search/
{
        "query": { 
        "bool": {
         "filter": {
                "term": {
                   "_id": "AUwNrOZsm6BwwrmnodbW"
                }
            }
        }
    }
}

What is the corresponding JAVA API to achieve this (using JestClient...)?

Answer 1

1) Client creation:

JestClientFactory factory = new JestClientFactory();
factory.setHttpClientConfig(new HttpClientConfig.Builder("http://localhost:9200")
                        .multiThreaded(true)
                        .build());
JestClient jestClient = factory.getObject();

2) Prepare the Search request:

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) Execute the search:

SearchResult result = jestClient.execute(search);

Note: We can add an alias name in place of index name and it works the same way.