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applies_to
serverless stack
ga
ga 9.4+
products
id
observability
id
elasticsearch
id
kibana
id
cloud-serverless
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cloud-hosted
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cloud-enterprise
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cloud-kubernetes
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elastic-stack
description Convert a string field to lowercase with the Streams lowercase processor in Streamlang.

Lowercase processor [streams-lowercase-processor]

The Lowercase processor converts a string field to lowercase.

To convert a field to lowercase:

  1. Select Create → Create processor.
  2. Select Lowercase from the Processor menu.
  3. Set the Source Field to the field you want to convert.
  4. (Optional) Set Target field to write the result to a different field.

YAML reference [streams-lowercase-yaml-reference]

In YAML mode, configure the lowercase processor using the following parameters. For the complete Streamlang syntax, refer to the Streamlang reference.

Parameter Type Required Description
from string Yes Source field.
to string No Target field. Defaults to the source field.
ignore_missing boolean No When true, skip this processor if the source field is missing. 
- action: lowercase
  from: attributes.method