Fix collecting index names when indices not provided

[norkunas]

Currently when trying to run bin/console meili:clear it returns:

Cannot clear index. Not found.
Done!

[curquiza]

Hello @norkunas! Thanks a lot for your PR, contributions are really appreciated. Can you describe what you succeeded to fix exactly? Did you want to make the message clearer?

[norkunas]

Currently we need to configure indices in config/packages/meili_search.yaml so I expect import/clear command to automatically take these indices to import or clear when I don't provide via --indices option.

The test shows what I expect :)

[curquiza]

This seems to be a good additon! thanks

bors merge

[bors]

Build succeeded:

• Code style
• integration-tests (PHP 7.4)
• integration-tests (PHP 8.0)

[norkunas]

Thanks for merging :)