How to cover all conditions when fetch all data with scroll?

Elastic Stack Elasticsearch
7

I tried doing what you describe:

diff --git a/client/rest-high-level/src/test/java/org/elasticsearch/client/documentation/SearchDocumentationIT.java b/client/rest-high-level/src/test/java/org/elasticsearch/client/documentation/SearchDocumentationIT.java
index 995a50508fc..6fba679b66e 100644
--- a/client/rest-high-level/src/test/java/org/elasticsearch/client/documentation/SearchDocumentationIT.java
+++ b/client/rest-high-level/src/test/java/org/elasticsearch/client/documentation/SearchDocumentationIT.java
@@ -709,6 +709,7 @@ public class SearchDocumentationIT extends ESRestHighLevelClientTestCase {
             searchRequest.scroll(scroll);
             SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
             searchSourceBuilder.query(matchQuery("title", "Elasticsearch"));
+            searchSourceBuilder.size(between(1, 10));
             searchRequest.source(searchSourceBuilder);

             SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT); // <1>

In the test there are three docs, so this covers the cases where the size is both smaller and larger than the number of docs. It still passes.