More like this query term questions

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We are using the More like this query and we have some questions about its operation (I have read this page More like this query | Elasticsearch Guide [8.4] | Elastic)

max_query_terms: The maximum number of query terms that will be selected

Are these selected at random or is it the 25 most frequent terms? Understanding that the other parameters will affect this

How are keyword type fields handled? Are they the same, e.g. treated as bags of query terms?

If I am performing a more like this query from a given document with a title, body, author name field, etc, how are these all weighted? Are they all considered equally important? Is this configurable?

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Is there a better place to ask this question?

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