awaitsFix indices.get_field_mapping/20_missing_field

Signed-off-by: Nicholas Walter Knize <nknize@apache.org>

Author: nknize

rest-api-spec/src/main/resources/rest-api-spec/test/indices.get_field_mapping/20_missing_field.yml

@@ -1,5 +1,9 @@
 ---
 "Return empty object if field doesn't exist, but index does":
+  - skip:
+      version: "all"
+      reason: "AwaitsFix https://github.com/opensearch-project/OpenSearch/issues/2440"
+
   - do:
         indices.create:
           index: test_index