test: E2E Elasticsearch 7.x highest and lowest versions

[kezhenxu94]

E2E tests ElasticSearch 7.0.0 and 7.9.3

Add ElasticSearch 7.0.0 and 7.9.3 to E2E tests, and fix a minor problem that some E2E tests are not executed because paths doesn't take effect.

• If this pull request closes/resolves/fixes an existing issue, replace the issue number. Ref Fix deadlock problem when using elasticsearch-client-7.0.0 #5775.
• Update the CHANGES log.

[codecov]

Codecov Report

Merging #5779 into master will decrease coverage by 21.60%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             master    #5779       +/-   ##
=============================================
- Coverage     51.48%   29.87%   -21.61%     
=============================================
  Files          1642     1558       -84     
  Lines         35108    32826     -2282     
  Branches       3833     4303      +470     
=============================================
- Hits          18076     9808     -8268     
- Misses        16128    22134     +6006     
+ Partials        904      884       -20     

Impacted Files	Coverage Δ	Complexity Δ
...he/skywalking/oal/rt/output/DispatcherContext.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
...skywalking/oal/rt/output/AllDispatcherContext.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
...ache/skywalking/oap/server/core/source/Source.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-2.00%)
...che/skywalking/oap/server/core/source/Service.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-3.00%)
...he/skywalking/oap/server/core/source/Endpoint.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-6.00%)
...he/skywalking/oap/server/core/source/GCPhrase.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
...e/skywalking/oap/server/core/CoreModuleConfig.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-2.00%)
.../skywalking/oap/server/core/alarm/AlarmModule.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-2.00%)
...ywalking/oap/server/core/config/ConfigService.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
...ywalking/oap/server/core/exporter/ExportEvent.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
... and 737 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 63c016d...e87bb78. Read the comment docs.