WIP: continued to refactor search; did the edit.

nomad/app/flask/api/repo.py

nomad/datamodel/__init__.py

nomad/datamodel/datamodel.py

nomad/files.py

nomad/metainfo/elastic_extension.py

nomad/metainfo/elasticsearch_extension.py

nomad/search/__init__.py

nomad/search/v0.py

nomad/search/v1.py

tests/app/flask/test_api.py

tests/app/flask/utils.py

tests/app/test_optimade.py

tests/app/v1/conftest.py

tests/app/v1/routers/test_datasets.py

tests/search/test_v1.py

tests/test_cli.py

tests/test_files.py

tests/utils.py