Updating a field in all documents of an Index

Elastic Stack Elasticsearch
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How can I update a field of all documents of an index with one CURL?

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Depending on the complexity of the logic for updating the field, you might consider using the update by query API or the reindex API, possibly with a script or ingest pipeline.

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Thanks, Christian, update by query works for me.
The simplest usage of just performs an update on every document in the index without changing the source. This is useful to pick up a new property or some other online mapping change. Here is the API:
curl -XPOST 'localhost:9200/twitter/_update_by_query?conflicts=proceed&pretty'
https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-update-by-query.html

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