Find total amount of disk space used by a Elasticsearch cluster

Question

I am looking for a way to get the total amount of disk space used by a Elasticsearch cluster. I have found suggestions to use the following REST API endpoints to obtain this information among other things:

GET /_cat/stats
GET /_nodes/stats

I was wondering can the same information be obtained using the Elasticsearch Java High-Level REST Client or the Transport Client in an older version of Elasticsearch?

There is no specific method to get node stats from high level client. You just need to call ```/_nodes/stats``` directly from your code — Sankar Prasanth Gadhamsetti, Sep 08 '20 at 06:27
@SankarPrasanthGadhamsetti I already provided this info in my answer also added a working code sample to achieve that :) — Amit, Sep 08 '20 at 07:54

score 2 · Accepted Answer · answered Sep 08 '20 at 04:57

Yes, you are correct that disk stats can be obtained using the _nodes/stats API as REST high-level client doesn't provide any direct API for node stats, you can see all the API supported by it here.

But you can use the low level rest client which is provide in high level client and below is the working example code.

 private void getDiskStats(RestHighLevelClient restHighLevelClient) throws IOException {
        RestClient lowLevelClient = restHighLevelClient.getLowLevelClient();
        Request request = new Request(
                "GET",
                "/_nodes/stats");
        Response response = lowLevelClient.performRequest(request);
        if (response.getStatusLine().getStatusCode() == 200) {
            System.out.println("resp: \n"+ EntityUtils.toString(response.getEntity()));
        }
    }

You can see I am printing the O/P of above API on console and verified that it contains the disk usage status which comes in below format:

"most_usage_estimate": {
"path": "/home/opster/runtime/elastic/elasticsearch-7.8.1/data/nodes/0",
"total_in_bytes": 124959473664,
"available_in_bytes": 6933352448,
"used_disk_percent": 94.45151916481107
},

Find total amount of disk space used by a Elasticsearch cluster

1 Answers1