merge to master

[skkosuri-amzn]

Issue #, if available:

Resolve user, backendroles, roles from threadcontext instead of /authinfo
Description of changes:

Resolve user, backendroles, roles from threadcontext instead of /authinfo

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Merging #289 into master will increase coverage by 0.78%.
The diff coverage is 41.02%.

@@             Coverage Diff              @@
##             master     #289      +/-   ##
============================================
+ Coverage     79.42%   80.21%   +0.78%     
+ Complexity      197      196       -1     
============================================
  Files           151      151              
  Lines          5211     5146      -65     
  Branches        673      668       -5     
============================================
- Hits           4139     4128      -11     
+ Misses          717      662      -55     
- Partials        355      356       +1     

Impacted Files	Coverage Δ	Complexity Δ
...csearch/alerting/action/IndexDestinationRequest.kt	100.00% <ø> (ø)	0.00 <0.00> (ø)
...asticsearch/alerting/action/IndexMonitorRequest.kt	100.00% <ø> (ø)	0.00 <0.00> (ø)
.../alerting/transport/TransportIndexMonitorAction.kt	59.09% <25.00%> (+4.19%)	0.00 <0.00> (ø)
...rch/alerting/transport/TransportGetAlertsAction.kt	75.38% <36.36%> (+13.74%)	0.00 <0.00> (ø)
...erting/transport/TransportGetDestinationsAction.kt	76.05% <36.36%> (+12.76%)	0.00 <0.00> (ø)
...rting/transport/TransportIndexDestinationAction.kt	54.95% <36.36%> (+3.62%)	0.00 <0.00> (ø)
...alerting/transport/TransportSearchMonitorAction.kt	58.33% <42.85%> (+29.76%)	0.00 <0.00> (ø)
...ndistroforelasticsearch/alerting/AlertingPlugin.kt	91.66% <100.00%> (+0.85%)	0.00 <0.00> (ø)
...relasticsearch/alerting/action/GetAlertsRequest.kt	100.00% <100.00%> (ø)	0.00 <0.00> (ø)
...icsearch/alerting/action/GetDestinationsRequest.kt	100.00% <100.00%> (ø)	0.00 <0.00> (ø)
... and 11 more

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