Update skip before backport

PR #53617 has yet to be backported so we should skip its integration
test on nodes earlier than 8.0.0

rest-api-spec/src/main/resources/rest-api-spec/test/search.aggregation/50_filter.yml

@@ -107,6 +107,10 @@ setup:
 
 ---
 "Sorting terms":
+  - skip:
+      version: " - 7.99.99"
+      reason: fixed in 8.0.0 to be backported to 7.7.0
+
   - do:
       bulk:
         refresh: true