Capture Exec output using Kotlin DSL

Please refer to the following Ant snippet when reading the rest of the issue description.

    <target name="git.log" depends="init">
        <exec executable="bash" failonerror="true">
            <arg line="${util.dir}/build/git-log2json.sh" />
            <redirector output="${build.app.java.dir}/commit.json" />
        </exec>
    </target>

The above ant target executes a shell script and writes the output of the script to a file. This file is then bundled as part of a war.

How does one achieve the same effect in Gradle when using Kotlin DSL? I’m guessing that an Exec task would be the way to go. However I’m not able to find any examples. FWIW I’m already using the built-in war plugin to create the war file.