elasticsearch Java API：matchAll搜索查询不返回结果吗？

Question

我有一个运行中的elasticsearch的内存实例，并做了一些探索性的编码来学习搜索Java
API。我能够将文档提交到索引并使用GET检索它们，但是当我尝试简单的搜索查询时，没有得到任何结果。

// first, try a get request, to make sure there is something in the index
GetResponse results = client.prepareGet(INDEX_NAME, INDEX_TYPE, testID)
        .execute()
        .actionGet();
// this assertion succeeds, as we expect it to.
assertThat(results.getId()).isEqualTo(testID);

// next, try the simplest possible search
SearchResponse s1 = client.prepareSearch(INDEX_NAME).setQuery(matchAllQuery())
        .execute()
        .actionGet();
// this assertion fails. why? answer: when we have an in-memory node, we have to 
// manually call refresh on the indexing, after submitting a document.
assertThat(s1.getHits().totalHits()).isGreaterThanOrEqualTo(1);

经过一些测试后，我认为问题出在我如何设置节点和关联的客户端（在内存中）：

@BeforeMethod
    public void setup() {
        // set up elastic search to run locally. since the transaction
        // log needs a filesystem, we can't run it as purely in memory,
        // but we can set the data directories into "target", so that maven will
        // clean up after the fact: http://bit.ly/OTN7Qf
        Settings settings = ImmutableSettings.settingsBuilder()
                .put("node.http.enabled", true)
                .put("path.logs","target/elasticsearch/logs")
                .put("path.data","target/elasticsearch/data")
                .put("gateway.type", "none")
                .put("index.store.type", "memory")
                .put("index.number_of_shards", 1)
                .put("index.number_of_replicas", 1).build();

        node = NodeBuilder.nodeBuilder().local(true).settings(settings).node();
        client = node.client();
    }

Answer 1

Googleelasticsearch小组中的某个人很友好，可以在这里帮助我。将文档提交到内存节点后，我需要刷新索引：

        node.client().admin().indices().prepareRefresh().execute().actionGet();

调用刷新解决了该问题。