Filebeat does not set the index for logstash output even after providing index name in filebeat

[Rupesh_Ranjan]

In my filebeat.full.yml file, i have set the following configuration

output.logstash:
enabled: true
hosts: ["localhost:5043"]
index: "testing-%{+yyyy.MM.dd}"

Even after this, the index name appears as "logstash-%{+yyyy.MM.dd}".
I do not want to set the index name in logstash config file separately.
Any suggestions, how can i set the index name as "testing-%{+yyyy.MM.dd}"?

P.S. I am using version 5.0.1 fro both filebeat and logstash.

[steffens (Steffen Siering)]

the index name must be set in logstash. The default pattern we provide in getting started docs for logstash also uses logstash to set the index name based on timestamp.

[Rupesh_Ranjan]

Thank you,
Can you tell me then, what the index in the question that i have posted, used for?

[steffens (Steffen Siering)]

The index field configured in logtash output in beats will be available in logstash via [@metadata][beat]. By default the value is filebeat.

Here is an example using [@metadata][beat] to configure the index pattern in logstash elasticsearch output.