Fix CalendarInterval year alias (#2026)

Co-authored-by: Quentin Pradet <quentin.pradet@elastic.co>

Author: esdrasbrz

output/schema/schema.json

@@ -263,7 +263,7 @@ export enum CalendarInterval {
   month,
   /** @aliases 1q */
   quarter,
-  /** @aliases 1Y */
+  /** @aliases 1y */
   year
 }