# Unique token filter not working with array of strings

**URL:** <https://discuss.elastic.co/t/unique-token-filter-not-working-with-array-of-strings/166353>\
**Category:** Elasticsearch\
**Created:** [January 30, 2019, 12:13pm UTC](https://discuss.elastic.co/t/unique-token-filter-not-working-with-array-of-strings/166353 "2019-01-30T12:13:58Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Fabrizio\_Fortino](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/fabrizio_fortino/32/1719_2.png) [@Fabrizio\_Fortino](https://discuss.elastic.co/u/Fabrizio_Fortino)\
**Post date:** [January 30, 2019, 12:13pm UTC](https://discuss.elastic.co/t/unique-token-filter-not-working-with-array-of-strings/166353/1 "2019-01-30T12:13:58Z")

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Continuing the discussion from [Unique token filter with string array](https://discuss.elastic.co/t/unique-token-filter-with-string-array/106887):

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](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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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [February 27, 2019, 12:14pm UTC](https://discuss.elastic.co/t/unique-token-filter-not-working-with-array-of-strings/166353/2 "2019-02-27T12:14:01Z")

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