Updated Kafka Input Pipeline config

I added the helk-kafka-broker2 to the list of Kafka instances in case the other one is down. more information about the kafka plugin: https://www.elastic.co/guide/en/logstash/current/plugins-inputs-kafka.html#plugins-inputs-kafka-bootstrap_servers

helk-logstash/pipeline/02-kafka-input.conf

@@ -6,7 +6,7 @@
 input {
   kafka
   {
-    bootstrap_servers => "helk-kafka-broker:9092"
+    bootstrap_servers => "helk-kafka-broker:9092,helk-kafka-broker2:9093"
     topics => ["winlogbeat"]
     decorate_events => true
     codec => "json"