Test connection

[corentinheadoo]

• test connection with ElasticSearch at start
• better management between process: return the correct number of documents treated
• clean some UT

[codecov]

Codecov Report

Merging #12 into master will decrease coverage by 2.1%.
The diff coverage is 79.71%.

@@             Coverage Diff              @@
##             master      #12      +/-   ##
============================================
- Coverage     94.97%   92.87%   -2.11%     
- Complexity      110      132      +22     
============================================
  Files             9        9              
  Lines           418      449      +31     
============================================
+ Hits            397      417      +20     
- Misses           21       32      +11

Impacted Files	Coverage Δ	Complexity Δ
Helper/ElasticSearchHelper.php	100% <100%> (ø)	4 <2> (+1)	⬆️
EventListener/ElasticSearchListener.php	85% <100%> (-0.42%)	18 <0> (+1)
Command/PopulateElasticCommand.php	91.35% <77.55%> (-6.32%)	45 <7> (+15)
Command/AbstractCommand.php	90.47% <78.57%> (-2.68%)	31 <0> (+5)
Handler/ElasticSearchHandler.php	89.28% <0%> (-1.04%)	9% <0%> (ø)
Event/ElasticSearchEvent.php	100% <0%> (ø)	3% <0%> (ø)	⬇️
...pendencyInjection/HeadooElasticSearchExtension.php	100% <0%> (ø)	1% <0%> (ø)	⬇️
... and 2 more

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