# What is the difference between setting or not cluster-name in elasticsearch output?
**URL:** https://discuss.elastic.co/t/what-is-the-difference-between-setting-or-not-cluster-name-in-elasticsearch-output/22043
**Category:** Elasticsearch
**Created:** [February 9, 2015, 11:05am UTC](https://discuss.elastic.co/t/what-is-the-difference-between-setting-or-not-cluster-name-in-elasticsearch-output/22043 "2015-02-09T11:05:02Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Federica\_Oltolina](https://discuss.elastic.co/u/Federica_Oltolina)
#### Post date: [February 9, 2015, 11:05am UTC](https://discuss.elastic.co/t/what-is-the-difference-between-setting-or-not-cluster-name-in-elasticsearch-output/22043/1 "2015-02-09T11:05:02Z")
Hello,
I have logstash flushing in an elasticsearch cluster named "mycluster", so
I configured output "elasticsearch" as follows:
_elasticsearch.yml:_
cluster.name: mycluster
...
_logstash.conf_
output {
elasticsearch {
host =\> "10.10.10.10"
# cluster =\> "mycluster"
```
protocol => "http"
}
```
}
Here I found that specifying the name of the cluster in logstash.conf is
optional
[http://logstash.net/docs/1.4.2/outputs/elasticsearch#cluster](http://logstash.net/docs/1.4.2/outputs/elasticsearch#cluster)
I made a test commenting cluster name in logstash.conf and everything seems
working properly
I would like to know:
1. what would be logstash behaviour in case more than one cluster exists on
same server?
2. what is the difference between specifying or not cluster name in
logstash.conf?
3. in general do we have some benefits specifying cluster name even if its
not required?
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---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 12:34am UTC](https://discuss.elastic.co/t/what-is-the-difference-between-setting-or-not-cluster-name-in-elasticsearch-output/22043/2 "2017-07-06T00:34:10Z")