add flag for session release

[Nicole00]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 80.00% and project coverage change: +0.04% 🎉

Comparison is base (e33b81a) 63.46% compared to head (5965d95) 63.51%.

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #541      +/-   ##
============================================
+ Coverage     63.46%   63.51%   +0.04%     
- Complexity      796      798       +2     
============================================
  Files            72       72              
  Lines          3881     3886       +5     
  Branches        535      537       +2     
============================================
+ Hits           2463     2468       +5     
- Misses         1050     1051       +1     
+ Partials        368      367       -1     

Files Changed	Coverage Δ
...va/com/vesoft/nebula/client/graph/SessionPool.java	53.27% <70.00%> (+0.68%)	⬆️
.../com/vesoft/nebula/client/graph/NebulaSession.java	74.07% <90.00%> (+0.16%)	⬆️

... and 1 file with indirect coverage changes

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