Aliases across many indices and default scoring function

Elastic Stack Elasticsearch
1

I could not find many explanations about querying and alias that sit in front of many indices and its implication regarding relevance scoring.
If we take a simple TFIDF approach, will each document be scored using a TF across all indices in the alias or will each document be scored only in its own individual index and then the documents returned by each index compete for relevance at the end?

Thanks,
Pierre

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Scoring applies to the documents in a given shard. Once that has happened, the scores are then ranked across all shards that return a result, to get the end result set for the client.

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