No way to retrieve _id from TermVectorResponse

[wewebber]

I can't see a way of retrieving the _id of a (multi-)term vector request from the NEST result, or therefore of matching vectors with documents in a multiterm request.

Consider the JSON query:

POST /xindex/xobject/_mtermvectors
{
     "ids" : ["b", "a", "c"],
     "parameters" : { "fields" : [ "text" ] }
}

This will give you a JSON result something like:

{
    "docs" : [
        {
            "_index" : "xindex",
            "_type" : "xobject",
            "_id" : "b",
            // ...
            "term_vectors" : {
                "text" : {
                    "terms": {
                        "cat" : { "term_freq" : 2 },
                        "dog" : { "term_freq" : 3 },
                        // ...
                    }
                }
            }
        }
        {
            // ...
            "_id": "c",
            // ...
        }
    ]
}

In NEST, this might look something like:

IMultiTermVectorResponse response = this.Client.MultiTermVectors<Xobject>(
        d => d.Ids(["b","a","c"]).Fields(m => m.Text));
IDictionary<string, TermVector> vectorsById = new Dictionary<string, TermVector>();
foreach (TermVectorResponse tvResponse in response.Documents)
{
    string docId = "HOW TO GET THIS?";;
    vectorsById.Add(docid, tvResponse.TermVectors["text"]);
}

There's no way that I can see how to get the "_id" value out of the TermVectorResponse object, nor from any related object. Nor are documents returned in the same order as the ids are specified in the query. So I can't see how to map from the requested document ID to the term vector for that document.

[Mpdreamz]

Thanks for reporting this @wewebber you are right there currently is no way to do this. Will try and take this on board for NEST 1.7 which we hope to release beginning next week.

[Mpdreamz]

Added a PR for this issue: #1492

Please note that you will have to switch to response.Docs in the pending update. This is to preserve backwards compatibility.