# Run a grok processor

**GET /_ingest/processor/grok**

Extract structured fields out of a single text field within a document.
You must choose which field to extract matched fields from, as well as the grok pattern you expect will match.
A grok pattern is like a regular expression that supports aliased expressions that can be reused.

[External documentation](https://www.elastic.co/docs/reference/enrich-processor/grok-processor)

## Servers
- http://api.example.com: http://api.example.com ()


## Authentication methods
- Api key auth


## Parameters




## Responses
### 200


#### Body: application/json (object)
- **patterns** (object)



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