Fix #1375, optimize get_pagesize() function call, and add testcases

[tingdai]

No description provided.

[codecov]

Codecov Report

Patch coverage: 97.14% and project coverage change: +0.03 🎉

Comparison is base (e6b1c61) 85.20% compared to head (2e6a95e) 85.24%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1384      +/-   ##
===========================================
+ Coverage    85.20%   85.24%   +0.03%     
===========================================
  Files          585      585              
  Lines        43738    43750      +12     
===========================================
+ Hits         37267    37293      +26     
+ Misses        6471     6457      -14     

Impacted Files	Coverage Δ
...modules/elastic_ecs/stix_transmission/connector.py	76.84% <92.85%> (+3.10%)	⬆️
...odules/elastic_ecs/stix_transmission/api_client.py	79.03% <100.00%> (+15.54%)	⬆️
...ic_ecs/tests/stix_transmission/test_elastic_ecs.py	100.00% <100.00%> (ø)

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