fix(fhir.core): Use "createdAt" for point-in-time resource document...

[apeteri]

...queries instead of "created"'s timestamp portion for backwards compatibility in datasets where no FHIR resource metadata is stored on version documents.

[cmark]

🥓

[codecov-commenter]

Codecov Report

Base: 64.23% // Head: 64.24% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (4031e11) compared to base (830f966).
Patch coverage: 33.33% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##                8.x    #1086   +/-   ##
=========================================
  Coverage     64.23%   64.24%           
- Complexity    12467    12469    +2     
=========================================
  Files          1734     1734           
  Lines         58217    58219    +2     
  Branches       5372     5373    +1     
=========================================
+ Hits          37396    37400    +4     
  Misses        18506    18506           
+ Partials       2315     2313    -2     

Impacted Files	Coverage Δ
...l/fhir/core/request/FhirResourceSearchRequest.java	76.23% <33.33%> (-0.27%)	⬇️
.../snomed/core/ecl/SnomedEclRefinementEvaluator.java	85.27% <0.00%> (+0.25%)	⬆️
...index/src/com/b2international/index/es/EsNode.java	82.29% <0.00%> (+1.04%)	⬆️
...onal/snowowl/snomed/core/tree/TerminologyTree.java	87.23% <0.00%> (+2.12%)	⬆️

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[nagyo]

LGTM!