Remove verbose debug logs from acker

Remove some debug log entries about acked events. Those log entries
turn out to be very verbose and of very little use. They do not carry
any information about the acked events, and we already have metrics
about acked events in the 30s metrics and monitoring HTTP endpoint.

filebeat/beater/acker.go

@@ -21,7 +21,6 @@ import (
 	"github.com/elastic/beats/v7/filebeat/input/file"
 	"github.com/elastic/beats/v7/libbeat/beat"
 	"github.com/elastic/beats/v7/libbeat/common/acker"
-	"github.com/elastic/elastic-agent-libs/logp"
 )
 
 type statefulLogger interface {
@@ -35,8 +34,6 @@ type statelessLogger interface {
 // eventAcker handles publisher pipeline ACKs and forwards
 // them to the registrar or directly to the stateless logger.
 func eventACKer(statelessOut statelessLogger, statefulOut statefulLogger) beat.EventListener {
-	log := logp.NewLogger("acker")
-
 	return acker.EventPrivateReporter(func(_ int, data []interface{}) {
 		stateless := 0
 		states := make([]file.State, 0, len(data))
@@ -56,12 +53,10 @@ func eventACKer(statelessOut statelessLogger, statefulOut statefulLogger) beat.E
 		}
 
 		if len(states) > 0 {
-			log.Debugw("stateful ack", "count", len(states))
 			statefulOut.Published(states)
 		}
 
 		if stateless > 0 {
-			log.Debugw("stateless ack", "count", stateless)
 			statelessOut.Published(stateless)
 		}
 	})