Move ES dependencies index mapping to JSON template file

[pavolloffay]

Supersedes #2149

In addition to the main feature implemented in the original PR:

• removes the creation of the dep. template from factory - it's not needed as it creates only writer
• fixes ES integration tests
• rebased

cc) @frittentheke

[codecov]

Codecov Report

Merging #2285 into master will increase coverage by 0.02%.
The diff coverage is 72.72%.

@@            Coverage Diff             @@
##           master    #2285      +/-   ##
==========================================
+ Coverage   96.18%   96.21%   +0.02%     
==========================================
  Files         219      218       -1     
  Lines       10688    10687       -1     
==========================================
+ Hits        10280    10282       +2     
+ Misses        352      350       -2     
+ Partials       56       55       -1     

Impacted Files	Coverage Δ
plugin/storage/es/dependencystore/storage.go	90.74% <0.00%> (+5.02%)	⬆️
plugin/storage/es/factory.go	100.00% <100.00%> (ø)
...lugin/sampling/strategystore/adaptive/processor.go	99.20% <0.00%> (-0.80%)	⬇️
cmd/query/app/server.go	94.80% <0.00%> (+2.59%)	⬆️

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[frittentheke]

@pavolloffay do you want me to close my other PR then?

[pavolloffay]

@frittentheke yes and thanks for the work you put into it.