Elasticsearch 2.1: Result window is too large (index.max_result_window)

Question

We retrieve information from Elasticsearch 2.1 and allow the user to page thru the results. When the user requests a high page number we get the following error message:

Answer 1

Use the Scroll API to get more than 10000 results.

Scroll example in ElasticSearch NEST API

I have used it like this:

private static Customer[] GetCustomers(IElasticClient elasticClient)
{
    var customers = new List<Customer>();
    var searchResult = elasticClient.Search<Customer>(s => s.Index(IndexAlias.ForCustomers())
                          .Size(10000).SearchType(SearchType.Scan).Scroll("1m"));

    do
    {
        var result = searchResult;
        searchResult = elasticClient.Scroll<Customer>("1m", result.ScrollId);
        customers.AddRange(searchResult.Documents);
    } while (searchResult.IsValid && searchResult.Documents.Any());

    return customers.ToArray();
}