Dependency resolution failure due to misunderstanding extras with incompatible variants

[michamos]

• I am on the latest Poetry version.
• I have searched the issues of this repo and believe that this is not a duplicate.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: Ubuntu 18.04.5 LTS
• Poetry version: 1.1.0
• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/michamos/6d86f62a18e54ea98754c0084c6e6d47

Issue

When trying to install invenio-search with extras = ["elasticsearch7"], dependency resolution fails. From the log of poetry install -vvv, it looks like poetry thinks that all elaststicsearch* extras should be installed simultaneously, whereas they are mutually exclusive in the invenio-search setup.py.

[github-actions]

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