Use Implementation-Title as default service name if it is available

[tobiasstadler]

What does this PR do?

When the MANIFEST.MF of main jar contains the Implementation-Title attribute, it is used as the default service name.

Checklist

• This is an enhancement of existing features, or a new feature in existing plugins
  • I have updated CHANGELOG.asciidoc
  • I have added tests that prove my fix is effective or that my feature works
  • Added an API method or config option? Document in which version this will be introduced
  • I have made corresponding changes to the documentation

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[tobiasstadler]

Could someone please have a look?

[tobiasstadler]

@SylvainJuge Maybe you can spare some time please.

[SylvainJuge]

run elasticsearch-ci/docs

[tobiasstadler]

@felixbarny Maybe you can spare some time please?

[SylvainJuge]

Hi @tobiasstadler, we have added this to our short-term backlog.
While we can't provide guarantees nor ETA, we will try to handle it soon.

[tobiasstadler]

Thank You! I am looking forward to it.

[tobiasstadler]

Any chance this will make it into 1.29.0?

[felixbarny]

This looks pretty straightforward.

It doesn't catch the Implementation-Title from within .war files but a good first step!

[felixbarny]

/test

[felixbarny]

run elasticsearch-ci/docs

[eyalkoren]

run elasticsearch-ci/docs

[tobiasstadler]

Thank You!