How to run Apollo download schema in custom Gradle task?

Question

I have this task

     tasks{
        register("my_build"){
            dependsOn(build)
            exec{
                commandLine("apollo schema:download --endpoint=https://*************************************/graphql schema.json
")
            }
        }
    }

I tried simple echo hello world for example and it worked, but now I want to execute that download schema command and it keeps giving error saying

A problem occurred starting process 'command 'apollo schema:download''