Join processor
Elastic Cloud Serverless projects are autoscaled environments, fully managed by Elastic and available on Elastic Cloud. Availability This functionality is generally available and ready for production usage. Serverless interfaces and procedures might differ from classic Elastic Stack deployments. The Elastic Stack includes Elastic's core products such as Elasticsearch, Kibana, Logstash, and Beats. Availability This functionality is generally available and ready for production usage. Unless stated otherwise on the page, this functionality is available when your Elastic Stack is deployed on Elastic Cloud Hosted, Elastic Cloud Enterprise, Elastic Cloud on Kubernetes, and self-managed environments. This documentation corresponds to the latest patch available for each minor version. If you're not using the latest patch, check the release notes for changes.
Serverless
Generally available
Stack
9.4+
Generally available since 9.4
The Join processor concatenates the values of multiple fields into a single field with a delimiter between them.
To join fields:
- Select Create → Create processor.
- Select Join from the Processor menu.
- Set the Source Fields to the fields you want to join.
- Set the Delimiter to the separator placed between values.
- Set the Target field where the joined result is stored.
In YAML mode, configure the join processor using the following parameters. For the complete Streamlang syntax, refer to the Streamlang reference.
| Parameter | Type | Required | Description |
|---|---|---|---|
from |
string[] | Yes | Source fields to join. |
delimiter |
string | Yes | Delimiter placed between values. |
to |
string | Yes | Target field. |
ignore_missing |
boolean | No | When true, skip this processor if any source field is missing. |
- action: join
from:
- attributes.last_name
- attributes.first_name
delimiter: ","
to: attributes.full_name