Running elasticdump is pretty easy. Just run a Docker container from the image and pass arguments and options to it:

$ docker run --rm -it pentimentolabs/elasticdump --input=http://production.es.com:9200/my_index --output=http://staging.es.com:9200/my_index --type=mapping

Since the pentimentolabs/elasticdump image tag numbers follow elasticdump versions numbering, you can also specify an elasticdump version by using Docker tags:

$ docker run --rm -it pentimentolabs/elasticdump:0.16.1 --input=http://production.es.com:9200/my_index --output=http://staging.es.com:9200/my_index --type=mapping

If no tag is provided, the latest version will be used.

See elasticdump documentation for detailed usage.