code: public void releaseAcquiredTrigger(OperableTrigger trigger, T jedis) throws JobPersistenceException {
          final String triggerHashKey = redisSchema.triggerHashKey(trigger.getKey());
          if(jedis.zscore(redisSchema.triggerStateKey(RedisTriggerState.ACQUIRED), triggerHashKey) != null){
              if(trigger.getNextFireTime() != null){
                  setTriggerState(RedisTriggerState.WAITING, (double) trigger.getNextFireTime().getTime(), triggerHashKey, jedis);
              }
              else{
                  unsetTriggerState(triggerHashKey, jedis);
              }
          }
      }
docs: Inform the <code>JobStore</code> that the scheduler no longer plans to
  fire the given <code>Trigger</code>, that it had previously acquired
  (reserved).
  @param trigger the trigger to be released
  @param jedis a thread-safe Redis connection