Disable replicas of a new index in Elasticsearch

To disable replicas of a new index in Elasticsearch, do as follows:

curl -XPUT 'localhost:9200/_template/logstash_template' -d '
{
  "template" : "logstash-*",
  "settings" : {
    "number_of_replicas" : 0
  }
}'

Reference:
http://stackoverflow.com/questions/24553718/updating-the-default-index-number-of-replicas-setting-for-new-indices