Filebeat GCP input remove erroneous error log (#36296)

Removing an erroneous error log that slipped in with the addition of input metrics to the gcp input

CHANGELOG.next.asciidoc

@@ -114,6 +114,7 @@ https://github.com/elastic/beats/compare/v8.8.1\...main[Check the HEAD diff]
 - Filter out duplicate paths resolved from matching globs. {issue}36253[36253] {pull}36256[36256]
 - Fix handling of TCP/UDP address resolution during metric initialization. {issue}35064[35064] {pull}36287[36287]
 - Fix handling of Juniper SRX structured data when there is no leading junos element. {issue}36270[36270] {pull}36308[36308]
+- Remove erroneous error log in GCPPubSub input. {pull}36296[36296]
 
 *Heartbeat*
 

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

@@ -147,7 +147,6 @@ func NewInput(cfg *conf.C, connector channel.Connector, inputContext input.Conte
 						in.metrics.ackedMessageCount.Inc()
 						in.metrics.bytesProcessedTotal.Add(uint64(len(msg.Data)))
 						in.metrics.processingTime.Update(time.Since(msg.PublishTime).Nanoseconds())
-						in.log.Error("ACKing pub/sub event")
 					} else {
 						in.metrics.failedAckedMessageCount.Inc()
 						in.log.Error("Failed ACKing pub/sub event")