How to match documents from different indexes?

Hello, I'm looking for a solution to match documents from different indexes.
Well, I have two indexes,
Index 1, contains documents with field message which is a string.
Index 2, contains documents with field regex.
How Can I apply all the regex in index2 to all the documents in Index1, to find for each string, the most matching regex ?
Thank you.

You would need to solve that manually.

Scroll the index 2 and for each document search in index 1.

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