Having problems with using .Scroll in Elasticsearch Nest 5.5

Question

I wanted to loop and scroll thru the data using the scrollid then I've upgraded to NEST 5.5 and trying to remediate this block of code:

scrollGetSearch = client.Raw.ScrollGet(scrollId, x => x
    .AddQueryString("scroll", "1m")
    .AddQueryString("size", "1000"));

Tried using using .Scroll but can't find the correct arguments for the scroll method:

scrollGetSearch = client.Scroll("1m",scrollId)

Getting the Error

The type arguments for method 'Nest.ElasticClient.Scroll(Nest.Time, string, System.Func,Nest.IScrollRequest>)' cannot be inferred from the usage. Try specifying the type arguments explicitly.

Russ Cam · Accepted Answer · 2017-10-04 21:05:01Z

1

Your first request uses the low level client, Elasticsearch.Net, whilst the second request uses the high level client.

To perform the same low level request in NEST 5.x would be

ElasticsearchResponse<T> lowLevelScrollResponse = client.LowLevel.ScrollGet<T>(x => x
    .AddQueryString("scroll_id", scrollId)
    .AddQueryString("scroll", "1m"));

The generic parameter T should be the type that the body of the response should be deserialized into e.g. string, byte[] or because you're using the low level client exposed on the high level client, the high level response, SearchResponse<TDocument>, where TDocument is the type that each _source should be deserialized into. There's no need to specify size on a scroll request as the size is configured on the first scroll call to _search endpoint.

To perform the same search with the high level client

ISearchResponse<T> scrollResponse = client.Scroll<T>("1m", scrollId);

answered Oct 4, 2017 at 21:05

Russ Cam

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2 Comments

user2756589 Over a year ago

What is the difference between high level and low level client?

Russ Cam Over a year ago

Take a look at the documentation on the clients which covers the differences: elastic.co/guide/en/elasticsearch/client/net-api/current/…

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