Simplify variable name from configuration to config

[terrymanu]

No description provided.

[codecov-commenter]

Codecov Report

Merging #2311 (aa4bd31) into master (f0c6852) will increase coverage by 0.06%.
Report is 16 commits behind head on master.
The diff coverage is 84.48%.

@@             Coverage Diff              @@
##             master    #2311      +/-   ##
============================================
+ Coverage     85.04%   85.10%   +0.06%     
+ Complexity     1237     1196      -41     
============================================
  Files           215      208       -7     
  Lines          3984     3893      -91     
  Branches        454      452       -2     
============================================
- Hits           3388     3313      -75     
+ Misses          390      381       -9     
+ Partials        206      199       -7     

Files	Coverage Δ
...b/error/handler/general/IgnoreJobErrorHandler.java	100.00% <ø> (ø)
...ob/error/handler/general/ThrowJobErrorHandler.java	100.00% <ø> (ø)
...asticjob/executor/item/JobItemExecutorFactory.java	100.00% <100.00%> (ø)
...gsphere/elasticjob/tracing/JobTracingEventBus.java	96.15% <100.00%> (+0.50%)	⬆️
...e/elasticjob/tracing/api/TracingConfiguration.java	100.00% <ø> (ø)
...racing/storage/TracingStorageConverterFactory.java	100.00% <100.00%> (ø)
...sticjob/tracing/yaml/YamlTracingConfiguration.java	0.00% <ø> (ø)
...racing/yaml/YamlTracingConfigurationConverter.java	85.71% <100.00%> (-14.29%)	⬇️
...racing/rdb/datasource/DataSourceConfiguration.java	85.71% <100.00%> (+6.99%)	⬆️
...job/tracing/rdb/datasource/DataSourceRegistry.java	88.88% <100.00%> (ø)
... and 29 more

... and 6 files with indirect coverage changes

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