Empty bulk request gives weird ElasticSearch error

[q42jaap]

I didn't realize that my bulk request was empty. NEST sent a completely empty request:

Request:

POST http://127.0.0.1:9200/_bulk HTTP/1.1
Accept: application/json
Content-Type: application/json
Host: 127.0.0.1:9200
Content-Length: 0

Response:

HTTP/1.1 400 Bad Request
Content-Type: application/json; charset=UTF-8
Content-Length: 86

{"error":"Failed to derive xcontent from org.elasticsearch.common.bytes.BytesArray@0"}

Code:

client.Bulk(bulk => {
    foreach (var x in xxx)
    {
      bulk.Index<X>(index => index
        .Object(x));
    }
    return bulk;
});

It might be a good idea for NEST to intercept this case and generate a better error... It also might be a breaking (since NEST doesn't throw exceptions right now)...