Dev.group by label

[tiberiu44]

Description

This PR contains the following updates:

• Added description of group_by operations in the labels
• Added graceful Elastic Search error handling
• Added option to skip elastic search push
• Added sanity check for execution of run_pipeline. Either --output-file must be specified or --no-elastic must be removed

Related Issue

Internal request

Motivation and Context

• group_by information was missing from the labels, which could result in ambiguous label readings
• Elastic should not be mandatory for simple pipelines, but the --no-elastic option was the only way we could avoid breaking changes

How Has This Been Tested?

I ran the pipeline several times to see that labels are generated correctly and I manually checked the execution sanity by trying different parameter combinations. Finally, I checked the graceful Elastic Errors by enabling elastic push and stopping my local instance

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• [-] I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• [-] I have added tests to cover my changes.
• All new and existing tests passed.