[feat] change extend method name to elasticsearch

[Aryalav]

This PR changes the extended name to simply "elasticsearch". So, in the environment, instead of:
SCOUT_DRIVER=Matchish\ScoutElasticSearch\Engines\ElasticSearchEngine
we can simply write:
SCOUT_DRIVER=elasticsearch

[hkulekci]

Hello @Aryalav, thank you for your contribution. Will it also work with class names to avoid backwards compatibility issues?

[matchish]

Also other drivers could have the same name elasticsearch. And I agree with @hkulekci that it's better to keep backward compatibility. as you can see now the tests are failed.
To summarise I'm ok if we could have shorter name as alternative but class name should work as well. And the string should be less generic to differentiate from other drivers

[matchish]

maybe an option is a config parameter, to specify alternative driver name

[Aryalav]

maybe an option is a config parameter, to specify alternative driver name

Thanks for your reply.
Sounds fair; I will add this as a key in the config.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.99%. Comparing base (9b675df) to head (be7f9e1).
Report is 9 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #276      +/-   ##
============================================
- Coverage     96.08%   95.99%   -0.10%     
  Complexity      194      194              
============================================
  Files            36       36              
  Lines           639      624      -15     
============================================
- Hits            614      599      -15     
  Misses           25       25              

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[matchish]

space needed 'elasticsearch.driver_name', ElasticSearchEngine::class

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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