docs: public ExecutorService getExecutor() {
          ExecutorService executor = executorServiceRef != null ? executorServiceRef.getService() : null;
          if (executor != null) {
              if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
                  Tr.debug(tc, "The Liberty ExecutorService is being used to run asynch reactive work");
              }
              return executor;
          } else {
              // For unit testing
              if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
                  Tr.debug(tc, "The ForkJoinPool.commonPool is being used to run asynch reactive work");
              }
              return ForkJoinPool.commonPool();
  
          }
      }