Change signal.rule.risk score mapping from keyword to float (#71126)

* Change risk_score mapping from keyword to float

* Change default alert histogram option

* Add version to signals template

* Fix test

* Undo histogram order change

Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

x-pack/plugins/security_solution/server/lib/detection_engine/routes/index/get_signals_template.ts

@@ -25,6 +25,7 @@ export const getSignalsTemplate = (index: string) => {
     },
     index_patterns: [`${index}-*`],
     mappings: ecsMapping.mappings,
+    version: 1,
   };
   return template;
 };

x-pack/plugins/security_solution/server/lib/detection_engine/routes/index/signals_mapping.json

@@ -68,7 +68,7 @@
                 "type": "keyword"
               },
               "risk_score": {
-                "type": "keyword"
+                "type": "float"
               },
               "risk_score_mapping": {
                 "properties": {