Can not create index "logstash-" after upgrading elasticsearch

Hi there,

I use logstash-output-amazone_es 2.0.1,amazon elasticsearch, kibana 5.5.2. It works properly for long time.

But after upgrading amazon elasticsearch 6.4, I can not create index started with logstash- (logstash-uat-2019.04, logstash-dev-2019.05, etc). But I can create index without started with logstash-

Current used ELK versions: elasticsearch 6.4.0, logstash 6.1.1, kibana 6.4.2

I would like to know why I can not create index started with logstash-
Is it related with _template/logstash ? If so, how to fix?
I would appreciate for any advise :slight_smile:

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