UT index_ttl_test is not stable

[Shylock-Hg]

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Describe the bug (must be provided)

I0831 14:35:11.951799 24317 AdminTaskManager.cpp:90] waiting for incoming task
F0831 14:35:11.951826 24322 RateLimiter.h:43] Check failed: buckets_.find({spaceId, partId}) != buckets_.end()
*** Check failure stack trace: ***
*** Aborted at 1630391711 (Unix time, try 'date -d @1630391711') ***
*** Signal 6 (SIGABRT) (0x3fd000024d4) received by PID 9428 (pthread TID 0x7ff52cbff700) (linux TID 24322) (maybe from PID 9428, UID 1021) (code: -6), stack trace: ***

Your Environments (must be provided)

• OS: uname -a
• Compliler: clang 10
• CPU: lscpu
• Commit id : master

How To Reproduce(must be provided)

Steps to reproduce the behavior:

Run UT directly.

Expected behavior

A clear and concise description of what you expected to happen.

Additional context

Provide logs and configs, or any other context to trace the problem.

[critical27]

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