[es/count] failed: [illegal_argument_exception] request [/p7/_count] contains unrecognized parameter: [q]

[koderBoy]

Java API client version

8.8.2

Java version

OpenJDK Runtime Environment (Temurin)(build 1.8.0_422-b05)

Elasticsearch Version

8.8.2

Problem description

 public static void main(String[] args) throws IOException {

        HttpHost httpHost = HttpHost.create("http://127.0.0.1:9200");
        RestClientBuilder restClientBuilder = RestClient.builder(httpHost);
        restClientBuilder.setHttpClientConfigCallback(httpAsyncClientBuilder -> {
            BasicCredentialsProvider credentialsProvider = new BasicCredentialsProvider();
            credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials("elastic", "elas!@#"));
            httpAsyncClientBuilder.setDefaultCredentialsProvider(credentialsProvider);
            return httpAsyncClientBuilder;
        });

        ElasticsearchClient client = new ElasticsearchClient(new RestClientTransport(restClientBuilder.build(),new JacksonJsonpMapper()));

        CountResponse count = client.count(req->req.index("p7").q("docNo:*"));
        System.out.println(count.count());
    }

[l-trotta]

Hello, thank you for reporting this! I tested it in the newer version of the client and it looks like it's still an issue, which is weird because the json serialization of the request matches exactly what the server should accept. I'll look into this and will update soon!

[l-trotta]

Found out what's happening: the server does not accept both q as a value when a body is provided, and for simplicity the java client always sends a body for POST requests, even when it's empty. Still undecided on how to fix this, in the meantime the suggested workaround it to perform the same query in the body, like this:

CountResponse count = esClient.count(req->req.index("p7")
    .query(q -> q.queryString(qs -> qs.query("docNo:*"))));

[koderBoy]

Found out what's happening: the server does not accept both q as a value when a body is provided, and for simplicity the java client always sends a body for POST requests, even when it's empty. Still undecided on how to fix this, in the meantime the suggested workaround it to perform the same query in the body, like this:

CountResponse count = esClient.count(req->req.index("p7")
.query(q -> q.queryString(qs -> qs.query("docNo:*"))));

This may seem like a solution to the problem, but it feels very strange as it does not match the API description of Elastcsearch

[l-trotta]

fixed in #926