[Filebeat] Add ECS tls & categorization fields to apache module (elas…

…tic#16121)

* Add ECS tls & categorization fields to apache module

- tls.cipher (access)
- tls.protocol (access)
- tls.protocol_version (access)
- event.kind (access)
- event.category (access)
- event.outcome (access)
- lowercase http.request.method for ECS compliance (access)
- event.kind (error)
- event.category (error)
- event.type (error)

Closes elastic#16032

CHANGELOG.next.asciidoc

@@ -120,6 +120,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - move create-[module,fileset,fields] to mage and enable in x-pack/filebeat {pull}15836[15836]
 - Add ECS tls and categorization fields to apache module. {issue}16032[16032] {pull}16121[16121]
 - move create-[module,fileset,fields] to mage and enable in x-pack/filebeat {pull}15836[15836]
+- Add ECS tls and categorization fields to apache module. {issue}16032[16032] {pull}16121[16121]
 
 *Heartbeat*