feat: new advanced search backend

[richardzilincikPantheon]

A new endpoint has been created for advanced search. Advanced search will make use of ES functionality instead of filtering over the results of the basic search in python code.

[codecov[bot]]

Codecov Report

Merging #721 (c619366) into develop (0928de4) will decrease coverage by 0.04%. The diff coverage is 38.09%.

:exclamation: Current head c619366 differs from pull request most recent head f490d5f. Consider uploading reports for the commit f490d5f to get more accurate results

@@             Coverage Diff             @@
##           develop     #721      +/-   ##
===========================================
- Coverage    77.71%   77.68%   -0.04%     
===========================================
  Files          114      114              
  Lines        12309    12348      +39     
===========================================
+ Hits          9566     9592      +26     
- Misses        2743     2756      +13     

Impacted Files	Coverage Δ
api/views/yangSearch/elkSearch.py	17.12% <4.76%> (-1.72%)	:arrow_down:
api/views/yangSearch/yangSearch.py	14.25% <9.37%> (-0.40%)	:arrow_down:
api/views/yangSearch/response_row.py	29.78% <10.00%> (+8.35%)	:arrow_up:
api/views/yangSearch/search_params.py	100.00% <100.00%> (ø)
redisConnections/redisConnection.py	92.82% <100.00%> (ø)
...isConnections/tests/test_redisModulesConnection.py	99.61% <100.00%> (ø)

[richardzilincikPantheon]

Since there needs to be additional data in the ES source JSONs, all modules need to be repopulated to the new yindex. This can be done with this script https://gist.github.com/richardzilincikPantheon/007dce495c874df756d8e98f71e93e1a. Needs to be run with the name of the new index as a command line arg.