Curator was first called clearESindices.py. Its sole function was to delete indices. It was almost immediately renamed to logstash_index_cleaner.py. After a time it was briefly relocated under the logstash repository as expire_logs, at which point it began to gain new functionality. Soon thereafter, Jordan Sissel was hired by Elastic (then still Elasticsearch), as was the original author of Curator. Not long after that it became Elasticsearch Curator and is now hosted at https://github.com/elastic/curator

Curator now performs many operations on your Elasticsearch indices, from delete to snapshot to shard allocation routing.