What's the best way to clone index in Elasticsearch 6.7
Snapshot the index and restore it in the same cluster using the rename functionality:
https://www.elastic.co/guide/en/elasticsearch/reference/current/snapshots-restore-snapshot.html#snapshots-restore-snapshot
Otherwise, you can do a reindex, but you're actually reindexing all the documents: https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-reindex.html
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