Use ElasticClusterManager

[oschulz]

Improvements in CustomClusterManagers.ElasticManager have been ported to ElasticClusterManager.ElasticManager now, CustomClusterManagers is now obsolete.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.39%. Comparing base (72ad5eb) to head (893f081).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
+ Coverage   66.77%   67.39%   +0.61%     
==========================================
  Files          20       19       -1     
  Lines        1514     1426      -88     
==========================================
- Hits         1011      961      -50     
+ Misses        503      465      -38     

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