Adds support for ES 7.9.0

[lezzago]

Issue #, if available:
#237

Description of changes:

• Bump ODFE version to 1.10.0
• Bump Elasticsearch version to 7.9.0

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 #238 into master will increase coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #238      +/-   ##
============================================
+ Coverage     76.96%   77.00%   +0.03%     
  Complexity      157      157              
============================================
  Files            75       75              
  Lines          2809     2809              
  Branches        430      430              
============================================
+ Hits           2162     2163       +1     
  Misses          428      428              
+ Partials        219      218       -1     

Impacted Files	Coverage Δ	Complexity Δ
...distroforelasticsearch/alerting/core/JobSweeper.kt	72.19% <0.00%> (+0.53%)	35.00% <0.00%> (ø%)

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