How to use [execution.kill]

The reference page of execution.kill has its arguments, constraints and declaration.

Cancels another running execution by its execution id. This is useful when you have previously returned an execution id to a caller and later want to stop that execution from another request or thread.

execution.kill:6c5a0bd3f7d64d6382d6cf3e7df5dc7c

The slot returns a boolean value indicating whether or not a matching live execution was found and cancelled.