[Bug]: memoryLeak in DataNode's rendezvousFlushManager

[czs007]

Is there an existing issue for this?

• I have searched the existing issues

Environment

- Milvus version: 2.3.X
- Deployment mode(standalone or cluster): both
- MQ type(rocksmq, pulsar or kafka):    
- SDK version(e.g. pymilvus v2.0.0rc2):
- OS(Ubuntu or CentOS): 
- CPU/Memory: 
- GPU: 
- Others:

Current Behavior

// rendezvousFlushManager makes sure insert & del buf all flushed
type rendezvousFlushManager struct {
	allocator.Allocator
	storage.ChunkManager
	Channel

	// segment id => flush queue
	dispatcher *typeutil.ConcurrentMap[int64, *orderFlushQueue]
	notifyFunc notifyMetaFunc

	dropping    atomic.Bool
	dropHandler dropHandler
	ctx         context.Context
	cancel      context.CancelFunc
	cleanLock   sync.RWMutex
	wg          sync.WaitGroup
	cleanInternal	time.Duration
}

🔃️ 上下文的话题
The dispatcher in the aforementioned data structure lacks the logic to reclaim its key, which can lead to memory leaks.

Expected Behavior

Incorporate a timed logic to attempt the cleanup of these segment IDs in dispacher.

Steps To Reproduce

As data is written or deleted, any occurrence of a new segment ID will result in a leak.

Milvus Log

No response

Anything else?

No response