The `add_entries` processor adds an entry to the event and is a [mutate event](https://github.com/opensearch-project/data-prepper/tree/main/data-prepper-plugins/mutate-event-processors#mutate-event-processors) processor. The following table describes the options you can use to configure the `add_entries` processor.
entries | Yes | List | List of events to be added. Valid entries are `key`, `value`, and `overwrite_if_key_exists`.
key | N/A | N/A | Key of the new event to be added.
value | N/A | N/A | Value of the new entry to be added. Valid data types are strings, booleans, numbers, null, nested objects, and arrays containing the aforementioned data types.
overwrite_if_key_exists | No | Boolean | If true, the existing value is overwritten if the key already exists within the event. Default value is `false`.
