ElasticSearch Update Mapping and Reindex

1. create an alias to current index

POST /tmp_index/_alias/current_index

2. create a new index with the correct mapping (or updated fields)

POST /new_index

3. reindex current index to new index

POST /_reindex

{ "source": { "index": "current_index" }, "dest": { "index": "new_index" } }

4. switch alias

POST /_aliases { "actions": [ { "remove": { "index": "tmp_index", "alias": "current_index" } }, { "add": { "index": "new_index", "alias": "current" } } ] }