Feature/refactor elasticsearch

[helllllllder]

What

• Ignore migration files when running black
• Add a time_based variable to define if the document index is time_based
• Overwrite search_index command to support creation on time based indices
• Update README.md with the new variables
• Update the tests using elasticsearch to delete the instance

Why

• Fix the black conflict with sonarcloud
• Solve the deletion problem with elasticsearch, as it wasn't deleting but taking the celery down
• Elasticsearch does not delete the instances like the db when testing, so it needed to be done manually

[coveralls]

Pull Request Test Coverage Report for Build 4420

• 36 of 38 (94.74%) changed or added relevant lines in 8 files are covered.
• 35 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.3%) to 79.602%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
bothub/common/models.py	14	16	87.5%

Files with Coverage Reduction	New Missed Lines	%
bothub/common/models.py	35	90.07%

Totals
Change from base Build 4395:	-0.3%
Covered Lines:	4156
Relevant Lines:	5221

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💛 - Coveralls

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication