Elasticsearch POST/my-index/_count 错误 406 Not Acceptable

Question

我正在使用 elasticsearch-java-client 7.17.4 向 AWS Elasticsearch 服务器发出计数请求，如下代码

elasticsearchClient.count(s -> s
    .index("my-index")
).count();

但是发生了以下异常

Caused by: org.elasticsearch.client.ResponseException: method [POST], 
host [https://my-host], URI [/my-index/_count], status line [HTTP/1.1 406 Not Acceptable]
{"error":"Content-Type header [application/vnd.elasticsearch+json; compatible-with=8] is not supported","status":406}

寻找 _count api at elasticsearch RestAPI reference听起来很奇怪，因为 http 方法是 GET，但是 elasticsearch-java 使用 POST 发出请求。

有人遇到过这个问题吗？

Answer 1

我忘记了一个重要的部分，响应正文是这样说的

{"error":"Content-Type header [application/vnd.elasticsearch+json; compatible-with=8] 
is not supported","status":406}

解决方案

RestClient restClient = RestClient
    .builder(new HttpHost(url, port, scheme))
    .setDefaultHeaders(new Header[]{
        new BasicHeader("Content-type", "application/json")
    })
    .build();