Optional task execution log indexing

[mdepak]

Since task execution log indexing can take up a considerable amount of space and CPU of elasticsearch and not used for any decision processing in the conductor, it can be optional and controlled using flag workflow.taskExecLog.indexing.enabled.

[codecov]

Codecov Report

Merging #1465 into dev will increase coverage by 0.02%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                dev    #1465      +/-   ##
============================================
+ Coverage     64.22%   64.24%   +0.02%     
- Complexity     3201     3203       +2     
============================================
  Files           262      262              
  Lines         15621    15623       +2     
  Branches       1555     1556       +1     
============================================
+ Hits          10032    10037       +5     
+ Misses         4753     4751       -2     
+ Partials        836      835       -1

Impacted Files	Coverage Δ	Complexity Δ
...nductor/core/orchestration/ExecutionDAOFacade.java	49.13% <100%> (-0.29%)	36 <0> (ø)
...m/netflix/conductor/core/config/Configuration.java	60% <100%> (+2.1%)	7 <1> (+1)	⬆️
...ava/com/netflix/conductor/server/JerseyModule.java	86.36% <0%> (ø)	5% <0%> (-1%)	⬇️
...netflix/conductor/contribs/queue/QueueManager.java	60.2% <0%> (+4.08%)	16% <0%> (+2%)	⬆️

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