elasticsearch java API：matchAll搜索查詢不返回結果？

Question

我有一個彈性搜索運行的內存實例，並做一些探索性編碼來學習搜索java API。 我能夠將文檔提交到索引並使用GET檢索它們，但是當我嘗試一個簡單的搜索查詢時，我沒有得到任何結果。

// 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);

經過一些測試，我認為問題在於我如何設置我的Node和相關客戶端（在內存中）：

@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

有彈性搜索谷歌小組的人非常友好地幫助我。 在將文檔提交到內存節點后，我需要刷新索引：

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

調用refresh修復了問題。