Script to re-index elasticsearch.
We started off with the default 5 shards of Elasticsearch and then suddenly realized, it was way beyond what we warranted for. After a conversation with the ES support team (which by the way is awesome! I definitely recommend them), we decided to downsize our shard level to 1. I've used elasticdump to carry out the task. It is fairly quick and versatile tool. The script assumes you have modified elasticsearch.yml to have the desired shard/index size, and have restarted the cluster for the property to take effect. The script is just a general reindexing script, it backups up the data, deletes the indices backed up and then restores from the backup. Check the script for more info.