如何使用Elastic的High Level Rest Client获取所有索引？ [英] How to get all indices with Elastic's High Level Rest Client?

问题描述

我希望使用它们的 Java REST客户端。我目前能够通过抓住他们的较低级别的客户端来做到这一点，就像这样：

I want a nice, quick and easy way to get all of the indices in elasticsearch using the their Java REST client. I am currently able to do this by grabbing their lower level client, like this:

public void fetchIndices() throws IOException {
    List<String> indices = null;

    RestClient restClient = client.getLowLevelClient();
    Response response = null;
    try {
        response = restClient.performRequest("GET", "/_cat/indices?v");
    } catch (IOException e) {
        LOGGER.log(Level.WARNING, e.toString(), e);
    }

    InputStream inputStream = null;
    if (response != null) {
        try {
            inputStream = response.getEntity().getContent();
        } catch (IOException e) {
            LOGGER.log(Level.WARNING, e.toString(), e);
        }
    }

    if (inputStream != null) {
        InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
        BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

        indices = new ArrayList<>();
        String line;
        while ((line = bufferedReader.readLine()) != null) {
            // Get tokens with no whitespace
            String[] tokens = line.split("\\s+");
            for (String token : tokens) {
                // TODO - make the startsWith() token configurable
                if (token.startsWith(SOME_TOKEN)) {
                    LOGGER.log(Level.INFO, "Found elasticsearch index " + token);
                    indices.add(token);
                    break;
                }
            }
        }
    }

    // Only update if we got data back from our REST call
    if (indices != null) {
        this.indices = indices;
    }
}

基本上，我只是称 / _cat / indices？v 端点按照他们的文档中的建议。这可以正常工作，但是我想知道是否有更好的方法来使用Java API。我似乎无法在他们当前的API中找到方法，但想知道是否有人知道我不了解的内容。必须使用 InputStream s和各种 Reader s并不一定很糟糕，而只是想清理hacky字符串解析。

Essentially I just call the /_cat/indices?v endpoint as recommended in their docs. This works fine, but I was wondering if there was a nicer way to do this using the Java API. I can't seem to find a way in their current API, but wondering if anyone knows something I don't. Having to work with InputStreams and the various Readers isn't necessarily terrible, but just want to clean up the hacky string parsing.

推荐答案

从Elasticsearch 7.5.0开始，您可以使用以下内容检索所有索引：

As of Elasticsearch 7.5.0 you can use the following to retrieve all indices:

    GetIndexRequest request = new GetIndexRequest("*");
    GetIndexResponse response = client.indices().get(request, RequestOptions.DEFAULT);
    String[] indices = response.getIndices();

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