Oracle Text: How to add/get stopwords list when using Oracle Text world lexer?

I have a use case that we currently use Oracle Text World Lexer to index and search multilingual documents. As we know that World Lexer does the language auto detection. I would like to know the following questions:
Is there anyway I can get the current document's language that Oracle Text detected?
Is there anyway to get the language's stopwords list?
Any thoughts and points will be appreciated.
- Charles

1. If you're using 12c, you can use ctx_doc.policy_languages. (https://docs.oracle.com/database/121/CCREF/cdocpkg011.htm#CCREF24102)
2. If you want multiple stoplists based on each document's language, you have to use the multi-lexer. For world_lexer, there is one stoplist; since the stoplists are somewhat dynamic (you can add but not remove them), the most accurate way to fetch the list is using ctx_report.describe_index or ctx_report.create_index_script and parse the report.

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Oracle Text: How to add/get stopwords list when using Oracle Text world lexer?

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