# How to convert the array elements to lowercase using logstash

**URL:** <https://discuss.elastic.co/t/how-to-convert-the-array-elements-to-lowercase-using-logstash/198413>\
**Category:** Logstash\
**Created:** [September 6, 2019, 11:58am UTC](https://discuss.elastic.co/t/how-to-convert-the-array-elements-to-lowercase-using-logstash/198413 "2019-09-06T11:58:18Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![vishnug](https://avatars.discourse-cdn.com/v4/letter/v/34f0e0/32.png) [@vishnug](https://discuss.elastic.co/u/vishnug)\
**Post date:** [September 6, 2019, 11:58am UTC](https://discuss.elastic.co/t/how-to-convert-the-array-elements-to-lowercase-using-logstash/198413/1 "2019-09-06T11:58:18Z")

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I have an array field in my elasticsearch document.

`Array = ["German", "Spanish" , "English"]`

I want to convert it to below format

`Array = ["greman", "spanish", "english"]`

How can I convert the array content to lowercase while reindexing using Logstash?

Thanks in advance

---

<div class="post-metadata">

**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\
**Post date:** [September 6, 2019, 12:30pm UTC](https://discuss.elastic.co/t/how-to-convert-the-array-elements-to-lowercase-using-logstash/198413/2 "2019-09-06T12:30:50Z")

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> [@vishnug](#):
>
> ["German", "Spanish" , "English"]

```
mutate { lowercase => ["Array"] }

```

results in

```
     "Array" => [
    [0] "german",
    [1] "spanish",
    [2] "english"
],

```

---

<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:** [October 4, 2019, 12:30pm UTC](https://discuss.elastic.co/t/how-to-convert-the-array-elements-to-lowercase-using-logstash/198413/3 "2019-10-04T12:30:53Z")

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