docs: add notes for query large size of data

Author: tianfeng92

calico-enterprise/observability/elastic/policy-activity.mdx

@@ -95,6 +95,13 @@ POST /tigera_secure_ee_policy_activity*/_search
 }
 ```
 
+::: note
+
+If you need to retrieve more than 10,000 logs, do not simply increase the size. Instead, use pagination (specifically the `search_after` parameter) to scroll through results efficiently.
+
+[Learn more](https://www.elastic.co/docs/reference/elasticsearch/rest-apis/paginate-search-results)
+:::
+
 ### Step 2: Retrieve all network policies and rules
 
 Export your current policy and rule inventory using `kubectl get ...` commands.