Why do fielddata still exist in new versions of Elasticsearch?

Can not they be discontinued?

Are doc_values ​​currently unable to replace them?

In what cases are fielddata necessary, since we can use doc_value in a much more performative way?

It can be useful when you still need to generate multiple terms from a given text vs indexing the whole text.
It can be useful when you prefer to pay the cost of memory usage than index space...

So I believe this can be still useful.

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