logStashImage parameter now contains "logstash:6.6.0" value.

Container based on image logstash:6.6.0 solved the "/var/lib/logstash is not writable" error

Signed-off-by: Denis Maggiorotto <denis.maggiorotto@sunnyvale.it>

Author: denismaggior8

kubernetes/charts/weblogic-operator/values.yaml

@@ -87,7 +87,7 @@ elkIntegrationEnabled: false
 
 # logStashImage specifies the docker image containing logstash.
 # This parameter is ignored if 'elkIntegrationEnabled' is false.
-logStashImage: "logstash:5"
+logStashImage: "logstash:6.6.0"
 
 # elasticSearchHost specifies the hostname of where elasticsearch is running.
 # This parameter is ignored if 'elkIntegrationEnabled' is false.