Sometimes, you just want to cleanup old ElasticSearch indexes, especially logstash indexes can become quite numerous.

Deleting everything from a certain month:

curl -XDELETE http://127.0.0.1:9200/logstash-2016.6.[1-30]

Or multiple months:

curl -XDELETE http://127.0.0.1:9200/logstash-2016.[1-6].[1-30]