docs: Iv2InFlight findHandle(long ciHandle)
      {
          assert(!shouldCheckThreadIdAssertion() || m_expectedThreadId == Thread.currentThread().getId());
  
          /*
           * Check the partition specific queue of handles
           */
          int partitionId = getPartIdFromHandle(ciHandle);
          PartitionInFlightTracker partitionStuff = m_trackerMap.get(partitionId);
          if (partitionStuff == null) {
              // whoa, bad
              tmLog.error("Unable to find handle list for partition: " + partitionId +
                  ", client interface handle: " + ciHandle);
              return null;
          }
  
          Iv2InFlight inFlight = partitionStuff.m_inFlights.remove(ciHandle);
          if (inFlight != null) {
              m_acg.reduceBackpressure(inFlight.m_messageSize);
              m_outstandingTxns--;
              return inFlight;
          }
  
          return null;
      }