# Use Field as Fingerprint Instead of Generating One

**URL:** <https://discuss.elastic.co/t/use-field-as-fingerprint-instead-of-generating-one/164465>\
**Category:** Logstash\
**Created:** [January 16, 2019, 12:37pm UTC](https://discuss.elastic.co/t/use-field-as-fingerprint-instead-of-generating-one/164465 "2019-01-16T12:37:17Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Aralex](https://avatars.discourse-cdn.com/v4/letter/a/e56c9b/32.png) [@Aralex](https://discuss.elastic.co/u/Aralex)\
**Post date:** [January 16, 2019, 12:37pm UTC](https://discuss.elastic.co/t/use-field-as-fingerprint-instead-of-generating-one/164465/1 "2019-01-16T12:37:17Z")

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Hi,  
since I have a field with a unique value for each of my csv entries, how can I use that field value as a fingerprint instead of generating one, to avoid duplicates?  
I experimented with the csv filter for while, and was wondering about the above.

Thank you.

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<div class="post-metadata">

**Author:** ![Aralex](https://avatars.discourse-cdn.com/v4/letter/a/e56c9b/32.png) [@Aralex](https://discuss.elastic.co/u/Aralex)\
**Post date:** [January 16, 2019, 1:24pm UTC](https://discuss.elastic.co/t/use-field-as-fingerprint-instead-of-generating-one/164465/2 "2019-01-16T13:24:58Z")

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Would using that field as the source value work? (and leave all other parameters out)

filtering  
{  
source =\> ["my\_field"]  
}

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<div class="post-metadata">

**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\
**Post date:** [January 16, 2019, 1:41pm UTC](https://discuss.elastic.co/t/use-field-as-fingerprint-instead-of-generating-one/164465/3 "2019-01-16T13:41:30Z")

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If you have a unique ID in your data [you can use this as document ID in Elasticsearch](https://www.elastic.co/blog/logstash-lessons-handling-duplicates) instead of a fingerprint.

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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 13, 2019, 1:41pm UTC](https://discuss.elastic.co/t/use-field-as-fingerprint-instead-of-generating-one/164465/4 "2019-02-13T13:41:36Z")

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