Doc_values description mentioned in different chapter

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I've used that it said doc_values is not supported in text fields in the document of fielddata:

Most fields can use index-time, on-disk doc_values for this data access pattern, but text fields do not support doc_values .

However there is no metion about the doc_values in chapter of text and doc_value itself.

What's more, I've tested to use doc_value option in text field in version 7.1 as well, but there is no any exception or warning text emitted. Is this a bug or the description in fielddata is wrong?

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