# Unique token filter with string array

**URL:** <https://discuss.elastic.co/t/unique-token-filter-with-string-array/106887>\
**Category:** Elasticsearch\
**Created:** [November 8, 2017, 3:00pm UTC](https://discuss.elastic.co/t/unique-token-filter-with-string-array/106887 "2017-11-08T15:00:19Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![ebuildy](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ebuildy/32/6070_2.png) [@ebuildy](https://discuss.elastic.co/u/ebuildy)\
**Post date:** [November 8, 2017, 3:00pm UTC](https://discuss.elastic.co/t/unique-token-filter-with-string-array/106887/1 "2017-11-08T15:00:19Z")

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I am curious to know why "unique" / "shingle" token filter do not work if the field is an array of string?

```
{
	"text" : ["git", "git-merge", "git checkout"],
	"filter" : ["unique"],
	"tokenizer" : "standard"
}

```

Show duplicates.

---

<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:** [December 6, 2017, 3:00pm UTC](https://discuss.elastic.co/t/unique-token-filter-with-string-array/106887/2 "2017-12-06T15:00:35Z")

</div>

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