@Override
    public String toString() {
        return "ParallelExecutor{" +
               "executorService=" + executorService +
               ", isPaused=" + isPaused +
               ", isStopped=" + isStopped +
               ", threadCount=" + threadCount +
               ", threadNamePrefix='" + threadNamePrefix + '\'' +
               '}';
    }
If true, pause the executor's threads after they have completed their current task.
if false, resume all the executor's threads.
If already in the desired state, is a noop.
stroom-proxy/stroom-proxy-repo/src/main/java/stroom/proxy/repo/ParallelExecutor.java