code: public CacheConfigurationBuilder<K, V> withDiskStoreThreadPool(String threadPoolAlias, int concurrency) {
      return addOrReplaceConfiguration(new OffHeapDiskStoreConfiguration(threadPoolAlias, concurrency));
    }
docs: Adds a {@link ServiceConfiguration} for the {@link org.ehcache.impl.internal.store.disk.OffHeapDiskStore.Provider}
  indicating thread pool alias and write concurrency.
  
  @param threadPoolAlias the thread pool alias
  @param concurrency the write concurrency
  @return a new builder with the added configuration