Unique token filter not working with array of strings

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Continuing the discussion from Unique token filter with string array:

I'd like to raise again this question that has not been answered.

The unique token filter (https://www.elastic.co/guide/en/elasticsearch/reference/current/analysis-unique-tokenfilter.html) does not remove duplicates when the field is an array of strings. Is this the correct behavior? Is there any solution/workaround to achieve this?

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