Elasticsearch | Use of "docvalue_field" in a search query

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Going through this documentation:

https://www.elastic.co/guide/en/elasticsearch/reference/master/search-request-docvalue-fields.html

I'm trying to find out a real use case as why one would need the docvalue_field as part of the query? Already these are part of the source and can it not be achieved by means of source filtering ("_source": ....) if we're interested in specific fields?

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