Synonym IDF documentation

Does the advice on the advantages and disadvantages of synonym expansion need updating:

https://www.elastic.co/guide/en/elasticsearch/guide/current/synonyms-expand-or-contract.html

It seems that query side or index side synonym expansion makes no difference to the IDF, on the queryside it seems that there is a Lucene SynonymQuery that merges the doc frequency count.

Can someone clarify this?

Thanks

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