@Override
        public String toString() {
            return "BatchingWriteTxnWrapper{" +
                    "maxBatchSize=" + maxBatchSize +
                    ", batchCounter=" + batchCounter +
                    '}';
        }
Closes the txn and releases the single write lock
stroom-lmdb/src/main/java/stroom/lmdb/LmdbEnv.java