What are the default rollover settings? How to identify rollover settings in Logstash?

[shankarps (Shankar)]

I started working on an existing ELK installation. I see that it has rollover option daily. The logs are written to the logstash-* indices, rolling over daily, like this index name - logstash-2018.05.09.

I am trying to identify where this setting is applied.
I can see that it is not applied in the conf file. This is the output conf -

output {
elasticsearch { hosts => "localhost:9200" }
}

Notice that the index is not specified. I can see that the indexes do not have an alias either. There is no alias in the template "logstash-*".

I also checked the curator and cannot see any rollover settings there.

Is this rollover happening by default? What steps can i take to troubleshoot and identify the rollover settings in this ELK installation? Thanks.

[Badger]

@shankarps

The logs are written to the logstash-* indices, rolling over daily, like this index name - logstash-2018.05.09.

That is the default for the index option to the elasticsearch output if you do not supply one.

[Christian_Dahlqvist]

This is not using the rollover feature in Elasticsearch. Instead the index name is created in Logstash based on the value of the @timestamp field, before they are sent to Elasticsearch.