Fix broken x-pack/filebeat tests (elastic#18149) (elastic#18211)

The tests are failing due to the change in elastic#16784. The `fields` key is referenced in system tests so it needs to be present. (cherry picked from commit c7eff6c)
leweafan · May 12, 2020 · 2cf3098 · 2cf3098
1 parent 89a4647
commit 2cf3098
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diff --git a/x-pack/filebeat/module/netflow/_meta/fields.yml b/x-pack/filebeat/module/netflow/_meta/fields.yml
@@ -4,3 +4,4 @@
     Module for receiving NetFlow and IPFIX flow records over UDP. The module
     does not add fields beyond what the netflow input provides.
   skipdocs:
+  fields:
diff --git a/x-pack/filebeat/module/netflow/fields.go b/x-pack/filebeat/module/netflow/fields.go