At work I still run the Elasticsearch Cluster in version 5.6.4. While I’m eager to upgrade and keep up the pace, I don’t always have the chance to upgrade immediately. A customer of mine needed a small set of data in Excel. Elasticsearch 6 or moreover Kibana 6 offers the CSV export in the X-Pack extensions. To use that functionality, I needed to export a fragment of desired data from my production cluster. Since the Reindex API allows us to read data from remote and write it, I simply ramped up my private cluster in v 6.1.1 with Docker and started the reindexing.