[filebeat/netflow]: set event normalisation to true (elastic#38780)

* fix(input/netflow): revert event normalisation to true for netflow input

* doc: update CHANGELOG.next.asciidoc

* fix: update fields.asciidoc (unrelated to this work)

* doc: remove irrelevant comment

CHANGELOG.next.asciidoc

@@ -99,6 +99,7 @@ https://github.com/elastic/beats/compare/v8.8.1\...main[Check the HEAD diff]
 - Add missing provider registration and fix published entity for Active Directory entityanalytics provider. {pull}38645[38645]
 - Fix handling of un-parsed JSON in O365 module. {issue}37800[37800] {pull}38709[38709]
 - Fix filestream's registry GC: registry entries are now removed from the in-memory and disk store when they're older than the set TTL {issue}36761[36761] {pull}38488[38488]
+- Fix indexing failures by re-enabling event normalisation in netflow input. {issue}38703[38703] {pull}38780[38780]
 
 *Heartbeat*
 

x-pack/filebeat/input/netflow/input.go

@@ -116,9 +116,7 @@ func (n *netflowInput) Run(ctx v2.Context, connector beat.PipelineConnector) err
 	client, err := connector.ConnectWith(beat.ClientConfig{
 		PublishMode: beat.DefaultGuarantees,
 		Processing: beat.ProcessingConfig{
-			// This input only produces events with basic types so normalization
-			// is not required.
-			EventNormalization: boolPtr(false),
+			EventNormalization: boolPtr(true),
 		},
 		CloseRef:      ctx.Cancelation,
 		EventListener: nil,