* @param numberOfWorkers - Number of workers for this pool.
* @param filePath - Path to an implementation of a `ClusterWorker` file, which can be relative or absolute.
* @param opts - Options for this fixed cluster pool.
* @param numberOfWorkers - Number of workers for this pool.
* @param filePath - Path to an implementation of a `ClusterWorker` file, which can be relative or absolute.
* @param opts - Options for this fixed cluster pool.