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rename_keys

The rename_keys processor renames keys in an event.

Configuration

You can configure the rename_keys processor with the following options.

Option	Required	Description
`entries`	Yes	A list of event entries to rename.
`from_key`	Yes	The key of the entry to be renamed.
`to_key`	Yes	The new key of the entry.
`overwrite_if_to_key_exists`	No	When set to `true`, the existing value is overwritten if `key` already exists in the event. The default value is `false`.

Usage

To get started, create the following pipeline.yaml file:

pipeline:
  source:
    file:
      path: "/full/path/to/logs_json.log"
      record_type: "event"
      format: "json"
  processor:
    - rename_keys:
        entries:
        - from_key: "message"
          to_key: "newMessage"
          overwrite_if_to_key_exists: true
  sink:
    - stdout:

{% include copy.html %}

Next, create a log file named logs_json.log and replace the path in the file source of your pipeline.yaml file with that filepath. For more information, see Configuring Data Prepper.

For example, before you run the rename_keys processor, if the logs_json.log file contains the following event record:

{"message": "hello"}

When you run the rename_keys processor, it parses the message into the following "newMessage" output:

{"newMessage": "hello"}

If newMessage already exists, its existing value is overwritten with value.

Special considerations

Renaming operations occur in the order that the key-value pair entries are listed in the pipeline.yaml file. This means that chaining (where key-value pairs are renamed in sequence) is implicit in the rename_keys processor. See the following example pipeline.yaml file:

pipeline:
  source:
    file:
      path: "/full/path/to/logs_json.log"
      record_type: "event"
      format: "json"
  processor:
    - rename_keys:
        entries:
        - from_key: "message"
          to_key: "message2"
        - from_key: "message2"
          to_key: "message3"
  sink:
    - stdout:

Add the following contents to the logs_json.log file:

{"message": "hello"}