Add support for Elasticsearch 7.10.2

[qreshi]

Issue #, if available:

Description of changes:

• Add support for Elasticsearch 7.10.2
• Update ODFE version to 1.13.0.0
• Add release notes

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 #340 (3c0f192) into master (8618ae9) will increase coverage by 0.22%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #340      +/-   ##
============================================
+ Coverage     79.11%   79.33%   +0.22%     
- Complexity      199      202       +3     
============================================
  Files           151      151              
  Lines          5324     5324              
  Branches        701      701              
============================================
+ Hits           4212     4224      +12     
+ Misses          740      725      -15     
- Partials        372      375       +3     

Impacted Files	Coverage Δ	Complexity Δ
...distroforelasticsearch/alerting/util/IndexUtils.kt	71.42% <0.00%> (-2.39%)	0.00% <0.00%> (ø%)
...e/action/node/ScheduledJobsStatsTransportAction.kt	75.00% <0.00%> (ø)	8.00% <0.00%> (ø%)
...endistroforelasticsearch/alerting/MonitorRunner.kt	78.40% <0.00%> (+0.40%)	0.00% <0.00%> (ø%)
...roforelasticsearch/alerting/alerts/AlertIndices.kt	67.17% <0.00%> (+1.52%)	0.00% <0.00%> (ø%)
...asticsearch/alerting/core/schedule/JobScheduler.kt	75.71% <0.00%> (+4.28%)	15.00% <0.00%> (ø%)
...rch/alerting/core/action/node/ScheduledJobStats.kt	66.66% <0.00%> (+11.11%)	4.00% <0.00%> (+1.00%)
...arch/alerting/core/schedule/JobSchedulerMetrics.kt	76.47% <0.00%> (+17.64%)	6.00% <0.00%> (+2.00%)

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