fix: change es version check to support elasticsearch 8+

[kjschnei001]

Which problem is this PR solving?

• Allows for writing of spans to a v8 elasticsearch index.
• I am utilizing the library only for writing spans to an elasticsearch instance, so I can't confirm that these changes are sufficient for elasticsearch 8+ support in jaeger, but I do know that the _type field is incompatible in elasticsearch v8, and removing it allows me to successfully write to an index in elasticsearch v8.
• Even if it doesn't fully satisfy the requirements for v8 support, it does feel like a very safe change to make, as it doesn't modify the logic for v7 and lower versions of elasticsearch.

Short description of the changes

• This PR modifies the version check for elasticsearch to apply v7 logic to any version equal to or greater than v7.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.01 🎉

Comparison is base (f282d9b) 97.03% compared to head (ff35d00) 97.04%.

❗ Current head ff35d00 differs from pull request most recent head 93f3151. Consider uploading reports for the commit 93f3151 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4512      +/-   ##
==========================================
+ Coverage   97.03%   97.04%   +0.01%     
==========================================
  Files         301      300       -1     
  Lines       17817    17813       -4     
==========================================
- Hits        17289    17287       -2     
+ Misses        423      421       -2     
  Partials      105      105              

Flag	Coverage Δ
unittests	97.04% <ø> (+0.01%)	⬆️

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see 1 file with indirect coverage changes

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[yurishkuro]

The change needs to be demonstrated with CI running successfully against v8. I added it to the matrix, but I think there is some infra issue where a started DB is not recognized by our script, needs investigation.