fix(opendistro): discard not supported engine type from meta

[dpgaspar]

Discard not supported columns on Opendistro, alias and geo_point fields

Adds AWS IAM Authentication

[codecov-io]

Codecov Report

Merging #46 (0e18676) into master (f0b013e) will decrease coverage by 1.75%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master      #46      +/-   ##
==========================================
- Coverage   93.53%   91.77%   -1.76%     
==========================================
  Files          15       15              
  Lines         681      815     +134     
==========================================
+ Hits          637      748     +111     
- Misses         44       67      +23     

Flag	Coverage Δ
python	91.77% <75.00%> (-1.76%)	⬇️

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Impacted Files	Coverage Δ
es/opendistro/api.py	79.04% <43.47%> (-20.96%)	⬇️
es/baseapi.py	90.41% <75.00%> (-0.57%)	⬇️
es/opendistro/sqlalchemy.py	100.00% <100.00%> (ø)
es/tests/fixtures/fixtures.py	100.00% <100.00%> (ø)
es/tests/test_sqlalchemy.py	100.00% <100.00%> (ø)

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