# Does fingerprint filter prevent updating existing fields in a CSV File?

**URL:** <https://discuss.elastic.co/t/does-fingerprint-filter-prevent-updating-existing-fields-in-a-csv-file/235516>\
**Category:** Logstash\
**Created:** [June 3, 2020, 10:35am UTC](https://discuss.elastic.co/t/does-fingerprint-filter-prevent-updating-existing-fields-in-a-csv-file/235516 "2020-06-03T10:35:56Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Noel92](https://avatars.discourse-cdn.com/v4/letter/n/41988e/32.png) [@Noel92](https://discuss.elastic.co/u/Noel92)\
**Post date:** [June 3, 2020, 10:35am UTC](https://discuss.elastic.co/t/does-fingerprint-filter-prevent-updating-existing-fields-in-a-csv-file/235516/1 "2020-06-03T10:35:56Z")

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I use the fingerprint filter for my logstash filter as below and the output for elasticsearch to include the fingerprint as below

```auto
    filter {
    fingerprint {
        source => "message"
        target => "[@metadata][fingerprint]"
        method => "MURMUR3"
      }
    }

    output
   {
    document_id => "%{[@metadata][fingerprint]}"
    }

```

However, while this prevents duplication in terms of new fields being added, it does not update existing fields in the CSV File. On an existing field changing values in the CSV file, it does not reflect in Kibana. Any solution for this?

---

<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:** [July 1, 2020, 10:36am UTC](https://discuss.elastic.co/t/does-fingerprint-filter-prevent-updating-existing-fields-in-a-csv-file/235516/2 "2020-07-01T10:36:01Z")

</div>

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