406 Content-Type header [application/vnd.elasticsearch+json;compatible-with=8] is not supported

[langhaoabcd]

//Elastic.Clients.Elasticsearch: 8.13.5
var nameValueCollection = new NameValueCollection
{
    { "Content-Type", "application/json" }
};
var settings = new ElasticsearchClientSettings(new Uri(ES_URL))
                 .GlobalHeaders(nameValueCollection)
                .Authentication(new BasicAuthentication(ES_NAME, ES_PWD))
                .EnableDebugMode();
var elasticsearchClient = new ElasticsearchClient(settings);

var idsQuery = new IdsQuery();
idsQuery.Values = new Ids(new[] { "46016822" });
var response = await elasticsearchClient.DeleteByQueryAsync(new DeleteByQueryRequest("test_saas_index")
{
    Query = idsQuery
});

Invalid Elasticsearch response built from a unsuccessful (406) low level call on POST: /test_saas_index/_delete_by_query?pretty=true&error_trace=true
Exception: Request failed to execute. Call: Status code 406 from: POST /test_saas_index/_delete_by_query?pretty=true&error_trace=true. ServerError: Type: Reason: "Content-Type header [application/vnd.elasticsearch+json;compatible-with=8] is not supported"

Audit trail of this API call:

• [1] BadResponse: Node: http://localhost:9200/ Took: 00:00:01.1987679

OriginalException: Elastic.Transport.TransportException: Request failed to execute. Call: Status code 406 from: POST /test_saas_index/_delete_by_query?pretty=true&error_trace=true. ServerError: Type: Reason: "Content-Type header [application/vnd.elasticsearch+json;compatible-with=8] is not supported"

Request:

{
"query": {
"ids": {
"values": [
"46016822"
]
}
}
}

Response:

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

TCP states:

Established: 87
TimeWait: 14
CloseWait: 19

ThreadPool statistics:

Worker:
Busy: 0
Free: 32767
Min: 8
Max: 32767
IOCP:
Busy: 0
Free: 1000
Min: 8
Max: 1000

[flobernd]

Hi @langhaoabcd, what is the server version you are trying to connect to?

[langhaoabcd]

@flobernd Its Elasticsearch Clusters Version 7.4.0, but querying a single data is successful using method GetAsync()，multiple ids value using SearchAsync()/DeleteByQueryAsync unsuccessful

[flobernd]

Hi @langhaoabcd,

using the 8.x client on a 7.x cluster is not supported. Please check the version compatibility matrix on the README. You have to upgrade your cluster to 8.x or use NEST 7.17.

Some requests without a body might work, but the majority won't.