Purpose of SearchResult's documents() API in the Java client

[swolehee]

Versions (relevant - OpenSearch/Dashboard/Server OS/Browser): 2.13.0

Describe the issue:

• It is not clear what the documents() API in the SearchResults does: SearchResult (java-client 2.13.0 API)
• The document does not provide any further information.
• I expected this API to return a list of results in the object class I defined. However, when I perform testing, this API always returns empty/null; instead, I have to iterate through searchResponse.hits().hits() to see the results, like example here: https://opensearch.org/docs/latest/clients/java/#searching-for-documents.

What is the proper way to set-up / use this API?