code: public void remove(String txn) {
          synchronized (filterMap) {
              // Check if old filter processor needs to be removed
              FilterProcessor oldfp = filterMap.get(txn);
              if (oldfp != null) {
                  globalExclusionFilters.remove(oldfp);
                  btxnFilters.remove(oldfp);
              }
          }
      }
docs: This method removes the transaction.
  
  @param txn The name of the transaction