Added Schema Check for Data View ID and Index (#3830)

(cherry picked from commit ec6038b)

Author: eric-forte-elastic

detection_rules/rule.py

@@ -708,6 +708,12 @@ def get_required_fields(self, index: str) -> List[dict]:
         if validator is not None:
             return validator.get_required_fields(index or [])
 
+    @validates_schema
+    def validates_index_and_data_view_id(self, data, **kwargs):
+        """Validate that either index or data_view_id is set, but not both."""
+        if data.get('index') and data.get('data_view_id'):
+            raise ValidationError("Only one of index or data_view_id should be set.")
+
     @validates_schema
     def validates_query_data(self, data, **kwargs):
         """Custom validation for query rule type and subclasses."""