unreadable message in ES when origin logs include Non-English characters

unreadable message in ES when the original logs is ㄅㄉˇˋㄓˊ˙ㄚㄞㄢㄦㄆ 中国 883.317µs ā á ǎ à ō ó ▅ ▆ ▇ █ 々

"message" : "�������������������������������� ������ 883.317��s �� �� �� �� �� �� ��� ��� ��� ��� ���",

Logging 5.4.2

Steps to reproduce:
1) create Non-English characters log genernate pod
oc new-app https://raw.githubusercontent.com/openshift/verification-tests/master/testdata/logging/loggen/container_json_unicode_log_template.json
2) Forward logs to ES
3) check the record in ES

oc exec it -n openshift-logging $ESPOD -c elasticsearch – es_util --query=app*/_search?pretty -d '{
"query": {
"bool" : {
"must" : [
{ "match" : { "kubernetes.namespace_name": "<pod_namespace_name>" }}
]
},
"size": 10
}'