[ISSUE #5047] Fix thread leak in TCP plugin

[TeslaCN]

Fixes #5047.

Make sure that:

• You have read the contribution guidelines.
• You submit test cases (unit or integration tests) that back your changes.
• Your local test passed ./mvnw clean install -Dmaven.javadoc.skip=true.

[codecov-commenter]

Codecov Report

Merging #5048 (2394653) into master (483902c) will not change coverage.
Report is 1 commits behind head on master.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #5048   +/-   ##
=========================================
  Coverage     64.06%   64.06%           
+ Complexity     8507     8496   -11     
=========================================
  Files          1208     1208           
  Lines         35540    35540           
  Branches       3206     3206           
=========================================
  Hits          22770    22770           
+ Misses        10923    10921    -2     
- Partials       1847     1849    +2     

see 6 files with indirect coverage changes

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