opensearch-docs-cn/_data-prepper/pipelines/configuration/processors/string-converter.md

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string_converter

The string_converter processor converts a string to uppercase or lowercase. You can use it as an example for developing your own processor. The following table describes the option you can use to configure the string_converter processor.

Option	Required	Type	Description
upper_case	No	Boolean	Whether to convert to uppercase (true) or lowercase (false).