Batch size is too large, size must be less than or equal to: [10000] but was [10001]. Scroll batch sizes cost as much memory as result windows so they are controlled by the [index.max_result_window] index level setting

[leln]

Hello,

I'm using Elasticsearch 5.1.1 and Nest 5.0 and I'm trying to search items by query.
This is the code:
var searchDescriptor = new SearchDescriptor()
.Index(indexName)
.Size(itemsPerShard)
.StoredFields((Field)"Id")
.Scroll("1m")
.Sort(ss => ss.Ascending(SortSpecialField.DocumentIndexOrder))
.Query(qd => qd
.QueryString(snd => snd
.Query(deleteByQuery)
.DefaultOperator(Operator.And))
);
var scanResults = client.Search(s => searchDescriptor);

When itemsPerShard > 10.000, I receive this error:
{Invalid NEST response built from a unsuccessful low level call on POST: /index/_search?scroll=1m}.
And in elasticsearch log file:
Batch size is too large, size must be less than or equal to: [10000] but was [10001]. Scroll batch sizes cost as much memory as result windows so they are controlled by the [index.max_result_window] index level setting.

How can I resolve this issue?

Thank you!

[jpountz (Adrien Grand)]

Why do you want the number of items per shard to be larger than 10000?