The REST Query pipeline stage is available in Fusion versions 3.0 and later.
In Fusion version 3.0 and earlier, this pipeline stage was called the Query RPC Stage. RPC is the acronym for Remote Procedure Calls.
The notation to send text as payload in Request entity (as string) field is <request.q>.

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Configuration

When entering configuration values in the UI, use unescaped characters, such as \t for the tab character. When entering configuration values in the API, use escaped characters, such as \\t for the tab character.