[Backport 2.1] [Backport 2.x] removed recursion from Explain Action to avoid stackoverflow in some …

[opensearch-trigger-bot]

Backport b63320b from #421

[codecov-commenter]

Codecov Report

Merging #426 (bb47686) into 2.1 (cb29e16) will increase coverage by 0.27%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##                2.1     #426      +/-   ##
============================================
+ Coverage     75.66%   75.94%   +0.27%     
- Complexity     2464     2465       +1     
============================================
  Files           313      313              
  Lines         14426    14411      -15     
  Branches       2230     2227       -3     
============================================
+ Hits          10915    10944      +29     
+ Misses         2267     2220      -47     
- Partials       1244     1247       +3     

Impacted Files	Coverage Δ
...transport/action/explain/TransportExplainAction.kt	72.34% <0.00%> (+5.34%)	⬆️
...nt/indexstatemanagement/model/destination/Chime.kt	55.55% <0.00%> (-22.23%)	⬇️
...gement/transform/model/ContinuousTransformStats.kt	70.37% <0.00%> (-3.71%)	⬇️
...earch/indexmanagement/transform/TransformRunner.kt	78.01% <0.00%> (-0.71%)	⬇️
.../opensearch/indexmanagement/rollup/model/Rollup.kt	85.58% <0.00%> (-0.47%)	⬇️
...earch/indexmanagement/transform/model/Transform.kt	85.47% <0.00%> (-0.43%)	⬇️
...arch/indexmanagement/rollup/RollupSearchService.kt	61.11% <0.00%> (ø)
...nt/indexstatemanagement/ManagedIndexCoordinator.kt	69.88% <0.00%> (+1.16%)	⬆️
...nt/rollup/action/stop/TransportStopRollupAction.kt	77.64% <0.00%> (+1.17%)	⬆️
.../rollup/action/start/TransportStartRollupAction.kt	72.94% <0.00%> (+1.17%)	⬆️
... and 5 more

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