First draft

Author: nastasha-solomon

solutions/security/detect-and-alert/cross-cluster-search-detection-rules.md

@@ -9,6 +9,12 @@ applies_to:
 
 [Cross-cluster search](../../search/cross-cluster-search.md) is an {{es}} feature that allows one cluster (the *local* cluster) to query data in a separate cluster (the *remote* cluster). {{elastic-sec}}'s detection rules can perform a cross-cluster search to query data in remote clusters.
 
+::::{admonition} Requirements
+* In {{stack}}, using cross-cluster search for {esql} rules requires an [Enterprise subscription](https://www.elastic.co/pricing).
+% * In serverless, behavioral detection integrations require the Security Analytics Complete [project feature](/deploy-manage/deploy/elastic-cloud/project-settings.md).
+* To learn more about the requirements for using cross-cluster search, refer to [Cross-cluster search](../../search/cross-cluster-search.md).
+
+::::
 
 ## Set up cross-cluster search in detection rules [set-up-ccs-rules]