@Override
    public void putIndexItem(StoreTxLogPosition txLogResult, K key, IndexItem<K> indexItem) {
        indexMap.put(key, indexItem);
        this.lastTxLog = txLogResult;
        currentChangeNum.incrementAndGet();
    }
@author Robert HG (254963746@qq.com) on 12/16/15.
lts-core/src/main/java/com/github/ltsopensource/kv/index/MemIndex.java