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This version of the OpenSearch documentation is no longer maintained. For the latest version, see the current documentation. For information about OpenSearch version maintenance, see Release Schedule and Maintenance Policy.


The trim_string processor removes whitespace from the beginning and end of a key and is a mutate string processor. The following table describes the option you can use to configure the trim_string processor.

Option Required Type Description
with_keys Yes List A list of keys to trim the whitespace from.
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